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 11 of 12 · sorted by risk, then score
Normal cycle60 on this page · tap one for its risk review
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-72947Windows File History Service
Elevation of Privilege · Severity Important · CVSS 6.4
In Windows File History Service, an attacker who already has admin rights could take higher privileges once they can run code on the PC. Microsoft severity Important, CVSS 6.4. Microsoft rates it "exploitation unlikely". Fixed in the September 2026 Windows security update (KB5122876, KB5122878, KB5122880) for 22 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-77887Windows DHCP Server
Remote Code Execution · Severity Important · CVSS 6.4
In Windows DHCP Server, an attacker who already has admin rights could run their own code once they can run code on the PC. Microsoft severity Important, CVSS 6.4. Microsoft rates it "exploitation less likely". 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-2026-77891Windows DHCP Server
Remote Code Execution · Severity Important · CVSS 6.4
In Windows DHCP Server, an attacker who already has admin rights could run their own code once they can run code on the PC. Microsoft severity Important, CVSS 6.4. Microsoft rates it "exploitation less likely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122882) for 16 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 29, 2026
CVE-2026-57095Win32k
Elevation of Privilege · Severity Important · CVSS 6.2 · Fixed earlier (July 2026)
In Win32k, an attacker with no account could take higher privileges once they can run code on the PC. Microsoft severity Important, CVSS 6.2. 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 (KB5099444, KB5099445, KB5099535) for 27 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-50453Windows USB Audio Class Driver
Information Disclosure · Severity Important · CVSS 6.1 · Fixed earlier (July 2026)
In Windows USB Audio Class Driver, an attacker with no account could read information they shouldn't see with physical access to the device. Microsoft severity Important, CVSS 6.1. Microsoft rates it "exploitation less likely". Microsoft disclosed it on September 8, 2026, but the fix had already shipped in the July 2026 Windows security update (KB5099444, KB5099445, KB5099535) for 27 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-68874Windows Program Compatibility Assistant Service
Information Disclosure · Severity Important · CVSS 5.7
In Windows Program Compatibility Assistant Service, an attacker with an ordinary user account could read information they shouldn't see over the network, but only if someone opens a file, link or message. Microsoft severity Important, CVSS 5.7. 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-2026-69317Windows Remote Desktop Client
Information Disclosure · Severity Important · CVSS 5.7
In Windows Remote Desktop Client, an attacker with an ordinary user account could read information they shouldn't see over the network, but only if someone opens a file, link or message. Microsoft severity Important, CVSS 5.7. 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-2026-69349Windows Management Instrumentation
Information Disclosure · Severity Important · CVSS 5.7
In Windows Management Instrumentation, an attacker with an ordinary user account could read information they shouldn't see over the network, but only if someone opens a file, link or message. Microsoft severity Important, CVSS 5.7. 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-2026-69372Windows Network File System
Denial of Service · Severity Important · CVSS 5.7
In Windows Network File System, an attacker with an ordinary user account could crash or stall the affected service over the network, but only if someone opens a file, link or message. Microsoft severity Important, CVSS 5.7. Microsoft rates it "exploitation less likely". 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-2026-69393Windows Spaceport.sys
Information Disclosure · Severity Important · CVSS 5.7
In Windows Spaceport.sys, an attacker with an ordinary user account could read information they shouldn't see over the network, but only if someone opens a file, link or message. Microsoft severity Important, CVSS 5.7. 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-2026-69552Windows Print Spooler Components
Information Disclosure · Severity Important · CVSS 5.7
In Windows Print Spooler Components, an attacker with an ordinary user account could read information they shouldn't see over the network, but only if someone opens a file, link or message. Microsoft severity Important, CVSS 5.7. 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-2026-69569Windows Print Spooler Components
Denial of Service · Severity Important · CVSS 5.7
In Windows Print Spooler Components, an attacker with an ordinary user account could crash or stall the affected service over the network, but only if someone opens a file, link or message. Microsoft severity Important, CVSS 5.7. 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-2026-69637Windows DHCP Server
Denial of Service · Severity Important · CVSS 5.7
In Windows DHCP Server, an attacker with an ordinary user account could crash or stall the affected service from the same local network without anyone clicking anything. Microsoft severity Important, CVSS 5.7. Microsoft rates it "exploitation less likely". 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-2026-69679Windows DHCP Server
Denial of Service · Severity Important · CVSS 5.7
In Windows DHCP Server, an attacker with an ordinary user account could crash or stall the affected service from the same local network without anyone clicking anything. Microsoft severity Important, CVSS 5.7. Microsoft rates it "exploitation less likely". 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-2026-68830Windows Universal Plug and Play (UPnP) Device Host
Information Disclosure · Severity Important · CVSS 5.5
In Windows Universal Plug and Play (UPnP) Device Host, an attacker with an ordinary user account could read information they shouldn't see once they can run code on the PC. Microsoft severity Important, CVSS 5.5. 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-2026-68831Windows Defender Firewall Service
Information Disclosure · Severity Important · CVSS 5.5
In Windows Defender Firewall Service, an attacker with an ordinary user account could read information they shouldn't see once they can run code on the PC. Microsoft severity Important, CVSS 5.5. 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-2026-68843Microsoft Office Word
Information Disclosure · Severity Important · CVSS 5.5
In Microsoft Office Word, an attacker with an ordinary user account could read information they shouldn't see once they can run code on the PC. Microsoft severity Important, CVSS 5.5. 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-2026-68851Windows NTFS
Information Disclosure · Severity Important · CVSS 5.5
In Windows NTFS, an attacker with an ordinary user account could read information they shouldn't see once they can run code on the PC. Microsoft severity Important, CVSS 5.5. 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-2026-68852Microsoft Account
Information Disclosure · Severity Important · CVSS 5.5
In Microsoft Account, an attacker with an ordinary user account could read information they shouldn't see once they can run code on the PC. Microsoft severity Important, CVSS 5.5. 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-2026-68873Windows Program Compatibility Assistant Service
Information Disclosure · Severity Important · CVSS 5.5
In Windows Program Compatibility Assistant Service, an attacker with an ordinary user account could read information they shouldn't see once they can run code on the PC. Microsoft severity Important, CVSS 5.5. 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-2026-68881Microsoft Standard XPS
Information Disclosure · Severity Important · CVSS 5.5
In Microsoft Standard XPS, an attacker with an ordinary user account could read information they shouldn't see once they can run code on the PC. Microsoft severity Important, CVSS 5.5. 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-2026-68886Windows Network Connection Broker
Information Disclosure · Severity Important · CVSS 5.5
In Windows Network Connection Broker, an attacker with an ordinary user account could read information they shouldn't see once they can run code on the PC. Microsoft severity Important, CVSS 5.5. 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-2026-68895Internet Storage Name Service
Information Disclosure · Severity Important · CVSS 5.5
In Internet Storage Name Service, an attacker with an ordinary user account could read information they shouldn't see once they can run code on the PC. Microsoft severity Important, CVSS 5.5. 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-2026-69286Windows USB Audio Class Driver
Information Disclosure · Severity Important · CVSS 5.5
In Windows USB Audio Class Driver, an attacker with an ordinary user account could read information they shouldn't see once they can run code on the PC. Microsoft severity Important, CVSS 5.5. 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-2026-69294Microsoft COM for Windows
Information Disclosure · Severity Important · CVSS 5.5
In Microsoft COM for Windows, an attacker with an ordinary user account could read information they shouldn't see once they can run code on the PC. Microsoft severity Important, CVSS 5.5. 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-2026-69303Push Message Routing Service
Information Disclosure · Severity Important · CVSS 5.5
In Push Message Routing Service, an attacker with an ordinary user account could read information they shouldn't see once they can run code on the PC. Microsoft severity Important, CVSS 5.5. 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-2026-69308Microsoft Standard XPS
Information Disclosure · Severity Important · CVSS 5.5
In Microsoft Standard XPS, an attacker with an ordinary user account could read information they shouldn't see once they can run code on the PC. Microsoft severity Important, CVSS 5.5. 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-2026-69315Windows License Manager
Information Disclosure · Severity Important · CVSS 5.5
In Windows License Manager, an attacker with an ordinary user account could read information they shouldn't see once they can run code on the PC. Microsoft severity Important, CVSS 5.5. 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-2026-69321Windows Power Dependency Coordinator
Tampering · Severity Important · CVSS 5.5
In Windows Power Dependency Coordinator, an attacker with an ordinary user account could change data or settings they shouldn't control once they can run code on the PC. Microsoft severity Important, CVSS 5.5. 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-2026-69339Windows MIDI Service Module
Information Disclosure · Severity Important · CVSS 5.5
In Windows MIDI Service Module, an attacker with an ordinary user account could read information they shouldn't see once they can run code on the PC. Microsoft severity Important, CVSS 5.5. Microsoft rates it "exploitation less likely". Fixed in the September 2026 Windows security update (KB5124008, KB5124012) for 6 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-69344Windows Print Spooler Components
Information Disclosure · Severity Important · CVSS 5.5
In Windows Print Spooler Components, an attacker with an ordinary user account could read information they shouldn't see once they can run code on the PC. Microsoft severity Important, CVSS 5.5. Microsoft rates it "exploitation less likely". Fixed in the September 2026 Windows security update (KB5122871, KB5122878, KB5122880) for 18 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-69345Microsoft Standard XPS
Information Disclosure · Severity Important · CVSS 5.5
In Microsoft Standard XPS, an attacker with an ordinary user account could read information they shouldn't see once they can run code on the PC. Microsoft severity Important, CVSS 5.5. 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-2026-69353Windows Text Shaping
Information Disclosure · Severity Important · CVSS 5.5
In Windows Text Shaping, an attacker with an ordinary user account could read information they shouldn't see once they can run code on the PC. Microsoft severity Important, CVSS 5.5. 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-2026-69367Microsoft Standard XPS
Information Disclosure · Severity Important · CVSS 5.5
In Microsoft Standard XPS, an attacker with an ordinary user account could read information they shouldn't see once they can run code on the PC. Microsoft severity Important, CVSS 5.5. 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-2026-69369Windows DNS
Information Disclosure · Severity Important · CVSS 5.5
In Windows DNS, an attacker with an ordinary user account could read information they shouldn't see once they can run code on the PC. Microsoft severity Important, CVSS 5.5. Microsoft rates it "exploitation less likely". 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-2026-69376Microsoft Standard XPS
Information Disclosure · Severity Important · CVSS 5.5
In Microsoft Standard XPS, an attacker with an ordinary user account could read information they shouldn't see once they can run code on the PC. Microsoft severity Important, CVSS 5.5. 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-2026-69390Windows Spaceport.sys
Information Disclosure · Severity Important · CVSS 5.5
In Windows Spaceport.sys, an attacker with an ordinary user account could read information they shouldn't see once they can run code on the PC. Microsoft severity Important, CVSS 5.5. 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-2026-69403Windows SMB Server
Information Disclosure · Severity Important · CVSS 5.5
In Windows SMB Server, an attacker with an ordinary user account could read information they shouldn't see once they can run code on the PC. Microsoft severity Important, CVSS 5.5. 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-2026-69453Microsoft Windows Search Component
Tampering · Severity Important · CVSS 5.5
In Microsoft Windows Search Component, an attacker with an ordinary user account could change data or settings they shouldn't control once they can run code on the PC. Microsoft severity Important, CVSS 5.5. 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-2026-69531Microsoft Windows Speech
Tampering · Severity Important · CVSS 5.5
In Microsoft Windows Speech, an attacker with an ordinary user account could change data or settings they shouldn't control once they can run code on the PC. Microsoft severity Important, CVSS 5.5. 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-2026-69554Microsoft Windows Search Component
Tampering · Severity Important · CVSS 5.5
In Microsoft Windows Search Component, an attacker with an ordinary user account could change data or settings they shouldn't control once they can run code on the PC. Microsoft severity Important, CVSS 5.5. 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-2026-69674Windows Modern Device Management (MDM)
Security Feature Bypass · Severity Important · CVSS 5.5
In Windows Modern Device Management (MDM), an attacker with an ordinary user account could get around a Windows security protection once they can run code on the PC. Microsoft severity Important, CVSS 5.5. Microsoft rates it "exploitation unlikely". 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-2026-70145Microsoft Windows Search Component
Information Disclosure · Severity Important · CVSS 5.5
In Microsoft Windows Search Component, an attacker with an ordinary user account could read information they shouldn't see once they can run code on the PC. Microsoft severity Important, CVSS 5.5. 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-2026-70290Win32k
Information Disclosure · Severity Important · CVSS 5.5
In Win32k, an attacker with an ordinary user account could read information they shouldn't see once they can run code on the PC. Microsoft severity Important, CVSS 5.5. 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-2026-71341Windows Partition Management Driver
Information Disclosure · Severity Important · CVSS 5.5
In Windows Partition Management Driver, an attacker with an ordinary user account could read information they shouldn't see once they can run code on the PC. Microsoft severity Important, CVSS 5.5. 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-2026-72964Windows Internet Connection Sharing (ICS)
Tampering · Severity Important · CVSS 5.5
In Windows Internet Connection Sharing (ICS), an attacker with an ordinary user account could change data or settings they shouldn't control once they can run code on the PC. Microsoft severity Important, CVSS 5.5. 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-2026-72966Windows Remote Access Connection Manager
Tampering · Severity Important · CVSS 5.5
In Windows Remote Access Connection Manager, an attacker with an ordinary user account could change data or settings they shouldn't control once they can run code on the PC. Microsoft severity Important, CVSS 5.5. Microsoft rates it "exploitation unlikely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 28 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-73004Windows Autopilot
Tampering · Severity Important · CVSS 5.5
In Windows Autopilot, an attacker with an ordinary user account could change data or settings they shouldn't control once they can run code on the PC. Microsoft severity Important, CVSS 5.5. Microsoft rates it "exploitation unlikely". Fixed in the September 2026 Windows security update (KB5122871, KB5122878, KB5122880) for 18 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-77491Windows GDI
Information Disclosure · Severity Important · CVSS 5.5
In Windows GDI, an attacker with no account could read information they shouldn't see once they can run code on the PC, but only if someone opens a file, link or message. Microsoft severity Important, CVSS 5.5. 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-2026-77492Windows Storage Port Driver
Elevation of Privilege · Severity Important · CVSS 5.5
In Windows Storage Port Driver, an attacker with an ordinary user account could take higher privileges once they can run code on the PC. Microsoft severity Important, CVSS 5.5. 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-2026-83991Windows Cloud Files Mini Filter Driver
Tampering · Severity Important · CVSS 5.5
In Windows Cloud Files Mini Filter Driver, an attacker with an ordinary user account could change data or settings they shouldn't control once they can run code on the PC. Microsoft severity Important, CVSS 5.5. 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-2026-42914Windows Kerberos
Denial of Service · Severity Important · CVSS 5.3 · Fixed earlier (June 2026)
In Windows Kerberos, an attacker with an ordinary user account could crash or stall the affected service over the network without anyone clicking anything. Microsoft severity Important, CVSS 5.3. Microsoft rates it "exploitation less likely". Microsoft disclosed it on September 8, 2026, but the fix had already shipped in the June 2026 Windows security update (KB5093998, KB5094041, KB5094042) for 30 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-68849Windows Bluetooth Port Driver
Information Disclosure · Severity Important · CVSS 4.7
In Windows Bluetooth Port Driver, an attacker with an ordinary user account could read information they shouldn't see once they can run code on the PC. Microsoft severity Important, CVSS 4.7. Microsoft rates it "exploitation less likely". Fixed in the September 2026 Windows security update (KB5122871, KB5122878, KB5122880) for 18 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-68891Microsoft Standard XPS
Information Disclosure · Severity Important · CVSS 4.7
In Microsoft Standard XPS, an attacker with an ordinary user account could read information they shouldn't see once they can run code on the PC. Microsoft severity Important, CVSS 4.7. 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-2026-69425Windows NTFS
Tampering · Severity Important · CVSS 4.7
In Windows NTFS, an attacker with an ordinary user account could change data or settings they shouldn't control once they can run code on the PC. Microsoft severity Important, CVSS 4.7. Microsoft rates it "exploitation unlikely". Fixed in the September 2026 Windows security update (KB5122880, KB5124008, KB5124012) for 8 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-69771Windows Container Manager Service
Security Feature Bypass · Severity Important · CVSS 4.7
In Windows Container Manager Service, an attacker with an ordinary user account could get around a Windows security protection once they can run code on the PC. Microsoft severity Important, CVSS 4.7. Microsoft rates it "exploitation unlikely". Fixed in the September 2026 Windows security update (KB5122880, KB5124008, KB5124012) for 8 supported Windows versions; a restart is required.
- Normal cycleWindowsSeptember 8, 2026
CVE-2026-69792Windows Win32K
Security Feature Bypass · Severity Important · CVSS 4.7
In Windows Win32K, an attacker with an ordinary user account could get around a Windows security protection once they can run code on the PC. Microsoft severity Important, CVSS 4.7. 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-2026-69548Windows RNDIS
Information Disclosure · Severity Important · CVSS 4.6
In Windows RNDIS, an attacker with no account could read information they shouldn't see with physical access to the device. Microsoft severity Important, CVSS 4.6. 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-2026-78452Microsoft Windows SCSI Class System File
Information Disclosure · Severity Important · CVSS 4.6
In Microsoft Windows SCSI Class System File, an attacker with no account could read information they shouldn't see with physical access to the device. Microsoft severity Important, CVSS 4.6. 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-2026-78508Windows CD-ROM Driver
Information Disclosure · Severity Important · CVSS 4.6
In Windows CD-ROM Driver, an attacker with no account could read information they shouldn't see with physical access to the device. Microsoft severity Important, CVSS 4.6. 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.
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.