Windows · Microsoft · released September 8, 2026
Windows security updates, September 2026: every vulnerability, rated
Microsoft published 705 Windows vulnerabilities in September 2026, most of them on Patch Tuesday, September 8, 2026. 71 are rated Critical. 1 was already being exploited, so it goes to the top of the list. 119 more deserve attention this week; 585 can follow the normal monthly rollout. 27 were fixed by an earlier update and only disclosed this month, so a PC that is already current is covered. The updates that carry these fixes need a restart.
- CVEs
- 705
- Patch now
- 1
- This week
- 119
- Normal cycle
- 543
- Low
- 42
Fixed in: September 2026 Windows security update restart requiredMicrosoft release notes
Page 7 of 12 · sorted by risk, then score
Normal cycle60 on this page · tap one for its risk review
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-83952Windows Resilient File System (ReFS)
Elevation of Privilege · Severity Important · CVSS 7.8
In Windows Resilient File System (ReFS), an attacker with an ordinary user account could take higher privileges once they can run code on the PC. Microsoft severity Important, CVSS 7.8. Microsoft rates it "exploitation less likely". Fixed in the September 2026 Windows security update (KB5122871, KB5124008, KB5124012) for 8 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-83954Windows Biometric Service
Elevation of Privilege · Severity Important · CVSS 7.8
In Windows Biometric Service, an attacker with an ordinary user account could take higher privileges once they can run code on the PC. Microsoft severity Important, CVSS 7.8. Microsoft rates it "exploitation unlikely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 26 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-83955Windows Biometric Service
Elevation of Privilege · Severity Important · CVSS 7.8
In Windows Biometric Service, an attacker with an ordinary user account could take higher privileges once they can run code on the PC. Microsoft severity Important, CVSS 7.8. Microsoft rates it "exploitation unlikely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 26 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-83967Windows Biometric Service
Elevation of Privilege · Severity Important · CVSS 7.8
In Windows Biometric Service, an attacker with an ordinary user account could take higher privileges once they can run code on the PC. Microsoft severity Important, CVSS 7.8. Microsoft rates it "exploitation unlikely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 26 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-83968Windows Biometric Service
Elevation of Privilege · Severity Important · CVSS 7.8
In Windows Biometric Service, an attacker with an ordinary user account could take higher privileges once they can run code on the PC. Microsoft severity Important, CVSS 7.8. Microsoft rates it "exploitation less likely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 26 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-83969Windows Biometric Service
Elevation of Privilege · Severity Important · CVSS 7.8
In Windows Biometric Service, an attacker with an ordinary user account could take higher privileges once they can run code on the PC. Microsoft severity Important, CVSS 7.8. Microsoft rates it "exploitation unlikely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 26 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-83970Windows Biometric Service
Elevation of Privilege · Severity Important · CVSS 7.8
In Windows Biometric Service, an attacker with an ordinary user account could take higher privileges once they can run code on the PC. Microsoft severity Important, CVSS 7.8. Microsoft rates it "exploitation less likely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 26 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-83971Windows Biometric Service
Elevation of Privilege · Severity Important · CVSS 7.8
In Windows Biometric Service, an attacker with an ordinary user account could take higher privileges once they can run code on the PC. Microsoft severity Important, CVSS 7.8. Microsoft rates it "exploitation unlikely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 26 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-83972Windows Biometric Service
Elevation of Privilege · Severity Important · CVSS 7.8
In Windows Biometric Service, an attacker with an ordinary user account could take higher privileges once they can run code on the PC. Microsoft severity Important, CVSS 7.8. Microsoft rates it "exploitation less likely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 26 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-83973Windows Biometric Service
Elevation of Privilege · Severity Important · CVSS 7.8
In Windows Biometric Service, an attacker with an ordinary user account could take higher privileges once they can run code on the PC. Microsoft severity Important, CVSS 7.8. Microsoft rates it "exploitation unlikely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 26 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-83974Windows Biometric Service
Elevation of Privilege · Severity Important · CVSS 7.8
In Windows Biometric Service, an attacker with an ordinary user account could take higher privileges once they can run code on the PC. Microsoft severity Important, CVSS 7.8. Microsoft rates it "exploitation unlikely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 26 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-83975Windows Biometric Service
Elevation of Privilege · Severity Important · CVSS 7.8
In Windows Biometric Service, an attacker with an ordinary user account could take higher privileges once they can run code on the PC. Microsoft severity Important, CVSS 7.8. Microsoft rates it "exploitation unlikely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 26 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-83976Windows Biometric Service
Elevation of Privilege · Severity Important · CVSS 7.8
In Windows Biometric Service, an attacker with an ordinary user account could take higher privileges once they can run code on the PC. Microsoft severity Important, CVSS 7.8. Microsoft rates it "exploitation unlikely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 26 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-83977Windows Biometric Service
Elevation of Privilege · Severity Important · CVSS 7.8
In Windows Biometric Service, an attacker with an ordinary user account could take higher privileges once they can run code on the PC. Microsoft severity Important, CVSS 7.8. Microsoft rates it "exploitation unlikely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 26 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-83978Windows Biometric Service
Elevation of Privilege · Severity Important · CVSS 7.8
In Windows Biometric Service, an attacker with an ordinary user account could take higher privileges once they can run code on the PC. Microsoft severity Important, CVSS 7.8. Microsoft rates it "exploitation unlikely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 26 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-83979Windows Biometric Service
Elevation of Privilege · Severity Important · CVSS 7.8
In Windows Biometric Service, an attacker with an ordinary user account could take higher privileges once they can run code on the PC. Microsoft severity Important, CVSS 7.8. Microsoft rates it "exploitation unlikely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 26 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-83980Windows Biometric Service
Elevation of Privilege · Severity Important · CVSS 7.8
In Windows Biometric Service, an attacker with an ordinary user account could take higher privileges once they can run code on the PC. Microsoft severity Important, CVSS 7.8. Microsoft rates it "exploitation less likely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 26 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-83981Windows Biometric Service
Elevation of Privilege · Severity Important · CVSS 7.8
In Windows Biometric Service, an attacker with an ordinary user account could take higher privileges once they can run code on the PC. Microsoft severity Important, CVSS 7.8. Microsoft rates it "exploitation unlikely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 26 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-83982Windows Biometric Service
Elevation of Privilege · Severity Important · CVSS 7.8
In Windows Biometric Service, an attacker with an ordinary user account could take higher privileges once they can run code on the PC. Microsoft severity Important, CVSS 7.8. Microsoft rates it "exploitation unlikely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 26 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-83983Windows Biometric Service
Elevation of Privilege · Severity Important · CVSS 7.8
In Windows Biometric Service, an attacker with an ordinary user account could take higher privileges once they can run code on the PC. Microsoft severity Important, CVSS 7.8. Microsoft rates it "exploitation unlikely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 26 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-83985Windows Biometric Service
Elevation of Privilege · Severity Important · CVSS 7.8
In Windows Biometric Service, an attacker with an ordinary user account could take higher privileges once they can run code on the PC. Microsoft severity Important, CVSS 7.8. Microsoft rates it "exploitation unlikely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 26 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-83986Windows Biometric Service
Elevation of Privilege · Severity Important · CVSS 7.8
In Windows Biometric Service, an attacker with an ordinary user account could take higher privileges once they can run code on the PC. Microsoft severity Important, CVSS 7.8. Microsoft rates it "exploitation unlikely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 26 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-83987Windows Biometric Service
Elevation of Privilege · Severity Important · CVSS 7.8
In Windows Biometric Service, an attacker with an ordinary user account could take higher privileges once they can run code on the PC. Microsoft severity Important, CVSS 7.8. Microsoft rates it "exploitation unlikely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 26 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-83988Windows Biometric Service
Elevation of Privilege · Severity Important · CVSS 7.8
In Windows Biometric Service, an attacker with an ordinary user account could take higher privileges once they can run code on the PC. Microsoft severity Important, CVSS 7.8. Microsoft rates it "exploitation unlikely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 26 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-83990Microsoft Graphics Component
Elevation of Privilege · Severity Important · CVSS 7.8
In Microsoft Graphics Component, an attacker with an ordinary user account could take higher privileges once they can run code on the PC. Microsoft severity Important, CVSS 7.8. Microsoft rates it "exploitation less likely". Fixed in the September 2026 Windows security update (KB5122871, KB5122880, KB5122882) for 12 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-83995Windows NTFS
Elevation of Privilege · Severity Important · CVSS 7.8
In Windows NTFS, an attacker with an ordinary user account could take higher privileges once they can run code on the PC. Microsoft severity Important, CVSS 7.8. Microsoft rates it "exploitation less likely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 30 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-84000Microsoft Graphics Component
Remote Code Execution · Severity Important · CVSS 7.8
In Microsoft Graphics Component, an attacker with an ordinary user account could run their own code once they can run code on the PC. Microsoft severity Important, CVSS 7.8. Microsoft rates it "exploitation unlikely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 30 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 29, 2026
CVE-2026-50414Windows Media
Elevation of Privilege · Severity Important · CVSS 7.5 · Fixed earlier (July 2026)
In Windows Media, an attacker with an ordinary user account could take higher privileges over the network without anyone clicking anything. Microsoft severity Important, CVSS 7.5. Microsoft rates it "exploitation unlikely". Microsoft disclosed it on September 29, 2026, but the fix had already shipped in the July 2026 Windows security update (KB5099536, KB5101649, KB5101650) for 8 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-62759Windows Netlogon
Spoofing · Severity Important · CVSS 7.5
In Windows Netlogon, an attacker with no account could impersonate a trusted user, site or file from the same local network without anyone clicking anything. Microsoft severity Important, CVSS 7.5. Microsoft rates it "exploitation unlikely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 30 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-62813Windows Active Directory Domain Services
Remote Code Execution · Severity Important · CVSS 7.5
In Windows Active Directory Domain Services, an attacker with an ordinary user account could run their own code over the network without anyone clicking anything. Microsoft severity Important, CVSS 7.5. Microsoft rates it "exploitation unlikely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 30 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-68887Windows Message Queuing Queue Manager
Denial of Service · Severity Important · CVSS 7.5 · EPSS 0.01
In Windows Message Queuing Queue Manager, an attacker with no account could crash or stall the affected service over the network without anyone clicking anything. Microsoft severity Important, CVSS 7.5. Microsoft rates it "exploitation unlikely". EPSS score 0.01, the modelled probability of exploitation activity in the next 30 days. Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 30 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-69329BranchCache
Denial of Service · Severity Important · CVSS 7.5 · EPSS 0.01
In BranchCache, an attacker with no account could crash or stall the affected service over the network without anyone clicking anything. Microsoft severity Important, CVSS 7.5. Microsoft rates it "exploitation unlikely". EPSS score 0.01, the modelled probability of exploitation activity in the next 30 days. Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 30 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-69342Windows DHCP Server
Denial of Service · Severity Important · CVSS 7.5 · EPSS 0.01
In Windows DHCP Server, an attacker with no account could crash or stall the affected service over the network without anyone clicking anything. Microsoft severity Important, CVSS 7.5. Microsoft rates it "exploitation unlikely". EPSS score 0.01, the modelled probability of exploitation activity in the next 30 days. Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122882) for 16 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-69397Microsoft OpenSSH for Windows
Remote Code Execution · Severity Important · CVSS 7.5
In Microsoft OpenSSH for Windows, an attacker with no account could run their own code over the network, but only if someone opens a file, link or message. Microsoft severity Important, CVSS 7.5. Microsoft rates it "exploitation less likely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 22 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-69428Windows LDAP - Lightweight Directory Access Protocol
Denial of Service · Severity Important · CVSS 7.5 · EPSS 0.01
In Windows LDAP - Lightweight Directory Access Protocol, an attacker with no account could crash or stall the affected service over the network without anyone clicking anything. Microsoft severity Important, CVSS 7.5. Microsoft rates it "exploitation unlikely". EPSS score 0.01, the modelled probability of exploitation activity in the next 30 days. Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 30 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-69429Windows Internet Key Exchange (IKE) Protocol Extensions
Remote Code Execution · Severity Important · CVSS 7.5
In Windows Internet Key Exchange (IKE) Protocol Extensions, an attacker with an ordinary user account could run their own code over the network without anyone clicking anything. Microsoft severity Important, CVSS 7.5. Microsoft rates it "exploitation less likely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 22 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-69443Windows Device Health Attestation (DHA)
Information Disclosure · Severity Important · CVSS 7.5 · EPSS 0.01
In Windows Device Health Attestation (DHA), an attacker with no account could read information they shouldn't see over the network without anyone clicking anything. Microsoft severity Important, CVSS 7.5. Microsoft rates it "exploitation less likely". EPSS score 0.01, the modelled probability of exploitation activity in the next 30 days. Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122882) for 8 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-69514Remote Desktop Services
Remote Code Execution · Severity Important · CVSS 7.5
In Remote Desktop Services, an attacker with an ordinary user account could run their own code over the network without anyone clicking anything. Microsoft severity Important, CVSS 7.5. Microsoft rates it "exploitation unlikely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 30 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-69539Remote Desktop Services
Remote Code Execution · Severity Important · CVSS 7.5
In Remote Desktop Services, an attacker with an ordinary user account could run their own code over the network without anyone clicking anything. Microsoft severity Important, CVSS 7.5. Microsoft rates it "exploitation unlikely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 30 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-69587Windows Internet Key Exchange (IKE) Extension
Denial of Service · Severity Important · CVSS 7.5 · EPSS 0.01
In Windows Internet Key Exchange (IKE) Extension, an attacker with no account could crash or stall the affected service over the network without anyone clicking anything. Microsoft severity Important, CVSS 7.5. Microsoft rates it "exploitation unlikely". EPSS score 0.01, the modelled probability of exploitation activity in the next 30 days. Fixed in the September 2026 Windows security update (KB5122871, KB5122880, KB5122882) for 12 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-69588Windows TCP/IP
Denial of Service · Severity Important · CVSS 7.5 · EPSS 0.01
In Windows TCP/IP, an attacker with no account could crash or stall the affected service over the network without anyone clicking anything. Microsoft severity Important, CVSS 7.5. Microsoft rates it "exploitation unlikely". EPSS score 0.01, the modelled probability of exploitation activity in the next 30 days. Fixed in the September 2026 Windows security update (KB5122871, KB5122880, KB5122882) for 12 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-69599Remote Desktop Services
Remote Code Execution · Severity Important · CVSS 7.5
In Remote Desktop Services, an attacker with an ordinary user account could run their own code over the network without anyone clicking anything. Microsoft severity Important, CVSS 7.5. Microsoft rates it "exploitation less likely". Fixed in the September 2026 Windows security update (KB5122871, KB5122880, KB5124008) for 10 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-69607Windows Deployment Services
Remote Code Execution · Severity Important · CVSS 7.5
In Windows Deployment Services, an attacker with no account could run their own code over the network, but only if someone opens a file, link or message. Microsoft severity Important, CVSS 7.5. Microsoft rates it "exploitation unlikely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122882) for 16 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-69631Windows DNS
Denial of Service · Severity Important · CVSS 7.5 · EPSS 0.01
In Windows DNS, an attacker with no account could crash or stall the affected service over the network without anyone clicking anything. Microsoft severity Important, CVSS 7.5. Microsoft rates it "exploitation unlikely". EPSS score 0.01, the modelled probability of exploitation activity in the next 30 days. Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122882) for 16 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-69744Windows Kerberos
Denial of Service · Severity Important · CVSS 7.5 · EPSS 0.01
In Windows Kerberos, an attacker with no account could crash or stall the affected service over the network without anyone clicking anything. Microsoft severity Important, CVSS 7.5. Microsoft rates it "exploitation unlikely". EPSS score 0.01, the modelled probability of exploitation activity in the next 30 days. Fixed in the September 2026 Windows security update (KB5122871, KB5124008) for 6 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-69760Windows Kerberos
Denial of Service · Severity Important · CVSS 7.5 · EPSS 0.01
In Windows Kerberos, an attacker with no account could crash or stall the affected service over the network without anyone clicking anything. Microsoft severity Important, CVSS 7.5. Microsoft rates it "exploitation unlikely". EPSS score 0.01, the modelled probability of exploitation activity in the next 30 days. Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 26 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-69793Windows TCP/IP
Security Feature Bypass · Severity Important · CVSS 7.5
In Windows TCP/IP, an attacker with no account could get around a Windows security protection over the network without anyone clicking anything. Microsoft severity Important, CVSS 7.5. Microsoft rates it "exploitation unlikely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 30 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-69809Windows Active Directory Domain Services
Denial of Service · Severity Important · CVSS 7.5 · EPSS 0.01
In Windows Active Directory Domain Services, an attacker with no account could crash or stall the affected service over the network without anyone clicking anything. Microsoft severity Important, CVSS 7.5. Microsoft rates it "exploitation unlikely". EPSS score 0.01, the modelled probability of exploitation activity in the next 30 days. Fixed in the September 2026 Windows security update (KB5122871, KB5122880, KB5122882) for 12 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-69881Windows Internet Key Exchange (IKE) Extension
Denial of Service · Severity Important · CVSS 7.5 · EPSS 0.01
In Windows Internet Key Exchange (IKE) Extension, an attacker with no account could crash or stall the affected service over the network without anyone clicking anything. Microsoft severity Important, CVSS 7.5. Microsoft rates it "exploitation unlikely". EPSS score 0.01, the modelled probability of exploitation activity in the next 30 days. Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 22 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-70570Windows Routing and Remote Access Service (RRAS)
Remote Code Execution · Severity Important · CVSS 7.5
In Windows Routing and Remote Access Service (RRAS), an attacker with no account could run their own code from the same local network without anyone clicking anything. Microsoft severity Important, CVSS 7.5. Microsoft rates it "exploitation unlikely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 30 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-70579Windows Mobile Broadband
Information Disclosure · Severity Important · CVSS 7.5 · EPSS 0.01
In Windows Mobile Broadband, an attacker with no account could read information they shouldn't see over the network without anyone clicking anything. Microsoft severity Important, CVSS 7.5. Microsoft rates it "exploitation unlikely". EPSS score 0.01, the modelled probability of exploitation activity in the next 30 days. Fixed in the September 2026 Windows security update (KB5122878, KB5122880, KB5124008) for 14 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-70587Windows Remote Desktop Protocol
Information Disclosure · Severity Important · CVSS 7.5 · EPSS 0.01
In Windows Remote Desktop Protocol, an attacker with no account could read information they shouldn't see over the network without anyone clicking anything. Microsoft severity Important, CVSS 7.5. Microsoft rates it "exploitation less likely". EPSS score 0.01, the modelled probability of exploitation activity in the next 30 days. Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 30 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-71330Windows Services for NFS ONCRPC XDR Driver
Information Disclosure · Severity Important · CVSS 7.5 · EPSS 0.01
In Windows Services for NFS ONCRPC XDR Driver, an attacker with no account could read information they shouldn't see over the network without anyone clicking anything. Microsoft severity Important, CVSS 7.5. Microsoft rates it "exploitation unlikely". EPSS score 0.01, the modelled probability of exploitation activity in the next 30 days. Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 30 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-72928Windows DNS Server
Remote Code Execution · Severity Important · CVSS 7.5
In Windows DNS Server, an attacker with an ordinary user account could run their own code over the network without anyone clicking anything. Microsoft severity Important, CVSS 7.5. Microsoft rates it "exploitation less likely". Fixed in the September 2026 Windows security update (KB5122871) for 2 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-72932Windows Message Queuing Queue Manager
Information Disclosure · Severity Important · CVSS 7.5 · EPSS 0.01
In Windows Message Queuing Queue Manager, an attacker with no account could read information they shouldn't see over the network without anyone clicking anything. Microsoft severity Important, CVSS 7.5. Microsoft rates it "exploitation unlikely". EPSS score 0.01, the modelled probability of exploitation activity in the next 30 days. Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 30 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-72943Windows Deployment Services
Remote Code Execution · Severity Important · CVSS 7.5
In Windows Deployment Services, an attacker with an ordinary user account could run their own code over the network without anyone clicking anything. Microsoft severity Important, CVSS 7.5. Microsoft rates it "exploitation unlikely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122882) for 16 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-72949Windows SMB Server Network Transport Driver (srvnet.sys)
Denial of Service · Severity Important · CVSS 7.5 · EPSS 0.01
In Windows SMB Server Network Transport Driver (srvnet.sys), an attacker with no account could crash or stall the affected service over the network without anyone clicking anything. Microsoft severity Important, CVSS 7.5. Microsoft rates it "exploitation less likely". EPSS score 0.01, the modelled probability of exploitation activity in the next 30 days. Fixed in the September 2026 Windows security update (KB5122871, KB5122880, KB5122882) for 12 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-72989Windows Failover Cluster
Information Disclosure · Severity Important · CVSS 7.5 · EPSS 0.01
In Windows Failover Cluster, an attacker with no account could read information they shouldn't see over the network without anyone clicking anything. Microsoft severity Important, CVSS 7.5. Microsoft rates it "exploitation less likely". EPSS score 0.01, the modelled probability of exploitation activity in the next 30 days. Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122882) for 8 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-77494Windows DHCP Server
Denial of Service · Severity Important · CVSS 7.5 · EPSS 0.01
In Windows DHCP Server, an attacker with no account could crash or stall the affected service over the network without anyone clicking anything. Microsoft severity Important, CVSS 7.5. Microsoft rates it "exploitation unlikely". EPSS score 0.01, the modelled probability of exploitation activity in the next 30 days. Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122882) for 16 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-77498Windows DHCP Server
Denial of Service · Severity Important · CVSS 7.5 · EPSS 0.01
In Windows DHCP Server, an attacker with no account could crash or stall the affected service over the network without anyone clicking anything. Microsoft severity Important, CVSS 7.5. Microsoft rates it "exploitation less likely". EPSS score 0.01, the modelled probability of exploitation activity in the next 30 days. Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122882) for 16 supported Windows versions; a restart is required.
Why an MSP manages this
Reading the list is the easy part
Nobody running a business reads all of them, and nobody should have to. The work is deciding which ones matter today, testing the fixes, getting them onto every PC and Mac without breaking the workday, and proving it was done.
- 01
Triage that starts with the exploited ones
Most of these fixes can ride the normal monthly rollout. A handful need action the same day. Telling them apart, every month, on every machine, is the core of the work, and it is the part an office manager rarely has time for.
- 02
Testing before everyone gets it
Updates go to a test ring and a pilot group first, so a broken accounting package or design tool shows up on two machines instead of forty, and the rollout pauses until it is sorted.
- 03
Restarts that don't wreck the workday
Windows updates usually need a restart and macOS updates often do. Deadlines, maintenance windows and grace periods get the fix installed without forcing a reboot in the middle of a client call.
- 04
Macs managed as seriously as PCs
Windows patching tools don't patch Macs. macOS updates need their own install-by deadlines through device management, and major upgrades need the same compatibility testing a Windows feature update gets.
- 05
A plan for machines that can't update
Hardware that ages out and versions past end of support stop getting every fix. They need a decision, isolate, upgrade or replace, before they become the easiest way in.
- 06
Proof when someone asks
Cyber insurance applications, customer security questionnaires and frameworks such as the FTC Safeguards Rule all ask how you keep systems patched. A managed service keeps the inventory and the reports that answer them.
The ins and outs
What keeping Windows and Mac patched actually involves
Windows
Patch Tuesday, and the exceptions
Microsoft ships security updates on the second Tuesday of each month, and out of band when something can't wait. This log marks the out-of-band ones.
Cumulative updates
Each month's Windows update carries the earlier months' fixes, so a PC that missed one catches up with the next, as long as it actually installs.
Fixed first, announced later
Some fixes ship before the vulnerability is disclosed. This log flags them, because a PC that is already current is already covered.
Rings, deferrals and deadlines
Windows Update for Business and Intune let you delay updates for a test group, set an install-by deadline and give a grace period before a forced restart.
Known Issue Rollback and safeguard holds
Microsoft can quietly roll back a change that breaks something, and holds back feature updates from PCs it knows will have trouble. Both explain why two PCs on the same network can be on different builds.
Feature updates and end of support
Each Windows version is serviced for a fixed period. Windows 10 PCs past end of support only get security fixes through the paid Extended Security Updates program.
Mac
No fixed release day
Apple publishes security updates when they are ready, often several times a month around a major release, so Mac patching runs on alerts, not a calendar.
Updates versus upgrades
A point update (26.7 to 26.7.1) fixes problems. A major upgrade (Tahoe to Golden Gate) changes the system and needs the same app testing as a Windows feature update.
Older versions get some fixes, not all
Apple's deployment guide says not every security issue is fixed in previous major versions. Staying a version behind is a choice with a cost, not a safe default.
Install-by deadlines through device management
Without enforcement, a macOS update prompt can be put off again and again. Device management can set a deadline so the update installs on schedule.
Macs that age out
When a Mac can no longer run a current macOS version, it stops getting the full set of fixes. Inventory by model and macOS version shows which ones are next.
Apple Business for zero-touch setup
New Macs enrolled through Apple Business arrive already managed, so update policy applies from the first login instead of after someone remembers to enroll them.
Both platforms
Third-party apps aren't on these lists
Browsers, PDF readers, accounting software, VPN clients and plug-ins patch on their own schedules. A machine can be current on Windows or macOS and still exposed through an app.
Firmware and drivers
BIOS and UEFI firmware, docks and network gear get security fixes too, and they rarely update themselves.
Recovery keys before big changes
Before a feature update or a major macOS upgrade, confirm BitLocker and FileVault recovery keys are escrowed somewhere you can reach.
Laptops that are rarely in the office
Remote and travelling staff need updates delivered over the internet with the same deadlines as office machines, or they drift months behind.
You can't patch what you can't see
An up-to-date inventory of every PC and Mac, with its version and last update, is what turns a list like this one into a finished job.