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 2 of 12 · sorted by risk, then score
This week60 on this page
- This weekWindowsSeptember 8, 2026
CVE-2026-68876Windows Program Compatibility Assistant Service
Elevation of Privilege · Severity Important · CVSS 8
In Windows Program Compatibility Assistant Service, an attacker with an ordinary user account could take higher privileges over the network, but only if someone opens a file, link or message. Microsoft severity Important, CVSS 8.0. Microsoft rates it "exploitation more likely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 30 supported Windows versions; a restart is required.
- This weekWindowsSeptember 29, 2026
CVE-2026-68880Windows Win32k
Elevation of Privilege · Severity Important · CVSS 8 · Out of band
In Windows Win32k, an attacker with an ordinary user account could take higher privileges over the network, but only if someone opens a file, link or message. Microsoft severity Important, CVSS 8.0. Microsoft rates it "exploitation more likely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 30 supported Windows versions; a restart is required.
- This weekWindowsSeptember 8, 2026
CVE-2026-69301Windows Win32k
Elevation of Privilege · Severity Important · CVSS 8
In Windows Win32k, an attacker with an ordinary user account could take higher privileges over the network, but only if someone opens a file, link or message. Microsoft severity Important, CVSS 8.0. Microsoft rates it "exploitation more likely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 28 supported Windows versions; a restart is required.
- This weekWindowsSeptember 8, 2026
CVE-2026-69623Windows HTTP Print Provider
Remote Code Execution · Severity Important · CVSS 8
In Windows HTTP Print Provider, an attacker with an ordinary user account could run their own code over the network, but only if someone opens a file, link or message. Microsoft severity Important, CVSS 8.0. Microsoft rates it "exploitation more likely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 30 supported Windows versions; a restart is required.
- This weekWindowsSeptember 8, 2026
CVE-2026-69714Windows Device Association Service
Elevation of Privilege · Severity Important · CVSS 8
In Windows Device Association Service, an attacker with an ordinary user account could take higher privileges over the network, but only if someone opens a file, link or message. Microsoft severity Important, CVSS 8.0. Microsoft rates it "exploitation more likely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 30 supported Windows versions; a restart is required.
- This weekWindowsSeptember 9, 2026
CVE-2026-69777Windows DHCP Client
Elevation of Privilege · Severity Important · CVSS 8 · Out of band
In Windows DHCP Client, an attacker with an ordinary user account could take higher privileges from the same local network without anyone clicking anything. Microsoft severity Important, CVSS 8.0. Microsoft rates it "exploitation more likely". Fixed in the September 2026 Windows security update (KB5124008, KB5124012) for 6 supported Windows versions; a restart is required.
- This weekWindowsSeptember 29, 2026
CVE-2026-50332Windows Kernel
Elevation of Privilege · Severity Important · CVSS 7.8 · Fixed earlier (July 2026)
In Windows Kernel, 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 more likely". 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.
- This weekWindowsSeptember 22, 2026
CVE-2026-57091Windows File History Service
Elevation of Privilege · Severity Important · CVSS 7.8 · Fixed earlier (July 2026)
In Windows File History 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 more likely". Microsoft disclosed it on September 22, 2026, but the fix had already shipped in the July 2026 Windows security update (KB5099535, KB5099536, KB5099538) for 23 supported Windows versions; a restart is required.
- This weekWindowsSeptember 29, 2026
CVE-2026-61930Windows Kernel
Elevation of Privilege · Severity Important · CVSS 7.8 · Fixed earlier (August 2026)
In Windows Kernel, 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 more likely". Microsoft disclosed it on September 29, 2026, but the fix had already shipped in the August 2026 Windows security update (KB5120228, KB5120229, KB5120233) for 26 supported Windows versions; a restart is required.
- This weekWindowsSeptember 8, 2026
CVE-2026-69277Microsoft Local Security Authority (LSA) Server
Elevation of Privilege · Severity Important · CVSS 7.8
In Microsoft Local Security Authority (LSA) Server, 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 more likely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 30 supported Windows versions; a restart is required.
- This weekWindowsSeptember 8, 2026
CVE-2026-69391Windows Broker Infrastructure Service
Elevation of Privilege · Severity Important · CVSS 7.8
In Windows Broker Infrastructure 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 more likely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 26 supported Windows versions; a restart is required.
- This weekWindowsSeptember 8, 2026
CVE-2026-69450Windows Error Reporting
Elevation of Privilege · Severity Important · CVSS 7.8
In Windows Error Reporting, 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 more likely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 30 supported Windows versions; a restart is required.
- This weekWindowsSeptember 8, 2026
CVE-2026-69459Windows Power Dependency Coordinator
Elevation of Privilege · Severity Important · CVSS 7.8
In Windows Power Dependency Coordinator, 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 more likely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 22 supported Windows versions; a restart is required.
- This weekWindowsSeptember 8, 2026
CVE-2026-69478Windows Device Association Service
Elevation of Privilege · Severity Important · CVSS 7.8
In Windows Device Association 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 more likely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 26 supported Windows versions; a restart is required.
- This weekWindowsSeptember 8, 2026
CVE-2026-69541Virtual Hard Disk (VHD) Miniport Driver Elevation of Privilege Vulernability
Elevation of Privilege · Severity Important · CVSS 7.8
In Virtual Hard Disk (VHD) Miniport Driver Elevation of Privilege Vulernability, 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 more likely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 30 supported Windows versions; a restart is required.
- This weekWindowsSeptember 8, 2026
CVE-2026-69585Microsoft Windows Search Component
Elevation of Privilege · Severity Important · CVSS 7.8
In Microsoft Windows Search 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 more likely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 30 supported Windows versions; a restart is required.
- This weekWindowsSeptember 8, 2026
CVE-2026-69725Windows Hello
Elevation of Privilege · Severity Critical · CVSS 7.8
In Windows Hello, an attacker with an ordinary user account could take higher privileges once they can run code on the PC. Microsoft severity Critical, CVSS 7.8. Microsoft rates it "exploitation unlikely". Fixed in the September 2026 Windows security update (KB5122878, KB5122880, KB5124008) for 14 supported Windows versions; a restart is required.
- This weekWindowsSeptember 8, 2026
CVE-2026-69799Windows Hello
Elevation of Privilege · Severity Critical · CVSS 7.8
In Windows Hello, an attacker with an ordinary user account could take higher privileges once they can run code on the PC. Microsoft severity Critical, CVSS 7.8. Microsoft rates it "exploitation unlikely". Fixed in the September 2026 Windows security update (KB5122878, KB5122880, KB5124008) for 14 supported Windows versions; a restart is required.
- This weekWindowsSeptember 8, 2026
CVE-2026-69864Windows Hello
Elevation of Privilege · Severity Critical · CVSS 7.8
In Windows Hello, an attacker with an ordinary user account could take higher privileges once they can run code on the PC. Microsoft severity Critical, CVSS 7.8. Microsoft rates it "exploitation unlikely". Fixed in the September 2026 Windows security update (KB5122878, KB5122880, KB5124008) for 14 supported Windows versions; a restart is required.
- This weekWindowsSeptember 8, 2026
CVE-2026-69921Windows Print Spooler Components
Elevation of Privilege · Severity Important · CVSS 7.8
In Windows Print Spooler Components, 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 more likely". Fixed in the September 2026 Windows security update (KB5122871, KB5122878, KB5122880) for 18 supported Windows versions; a restart is required.
- This weekWindowsSeptember 8, 2026
CVE-2026-70289Windows Win32k
Elevation of Privilege · Severity Important · CVSS 7.8
In Windows Win32k, 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 more likely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 30 supported Windows versions; a restart is required.
- This weekWindowsSeptember 8, 2026
CVE-2026-70583Windows Core Messaging
Elevation of Privilege · Severity Important · CVSS 7.8
In Windows Core Messaging, 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 more likely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 26 supported Windows versions; a restart is required.
- This weekWindowsSeptember 8, 2026
CVE-2026-72957Windows Deployment Services
Remote Code Execution · Severity Critical · CVSS 7.8
In Windows Deployment Services, an attacker with an ordinary user account could run their own code once they can run code on the PC. Microsoft severity Critical, CVSS 7.8. Microsoft rates it "exploitation more likely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122882) for 16 supported Windows versions; a restart is required.
- This weekWindowsSeptember 8, 2026
CVE-2026-77500Windows Device Association Service
Elevation of Privilege · Severity Important · CVSS 7.8
In Windows Device Association 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 more likely". Fixed in the September 2026 Windows security update (KB5122876, KB5122878, KB5122880) for 22 supported Windows versions; a restart is required.
- This weekWindowsSeptember 8, 2026
CVE-2026-83498Windows Virtualization-Based Security (VBS) Enclave
Elevation of Privilege · Severity Critical · CVSS 7.8
In Windows Virtualization-Based Security (VBS) Enclave, an attacker with an ordinary user account could take higher privileges once they can run code on the PC. Microsoft severity Critical, CVSS 7.8. 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.
- This weekWindowsSeptember 8, 2026
CVE-2026-69710Windows Hello
Elevation of Privilege · Severity Critical · CVSS 7.5
In Windows Hello, an attacker who already has admin rights could take higher privileges once they can run code on the PC. Microsoft severity Critical, CVSS 7.5. Microsoft rates it "exploitation unlikely". Fixed in the September 2026 Windows security update (KB5122878, KB5122880, KB5124008) for 14 supported Windows versions; a restart is required.
- This weekWindowsSeptember 8, 2026
CVE-2026-69852Windows Routing and Remote Access Service (RRAS)
Remote Code Execution · Severity Critical · CVSS 7.5
In Windows Routing and Remote Access Service (RRAS), an attacker with an ordinary user account could run their own code over the network without anyone clicking anything. Microsoft severity Critical, CVSS 7.5. Microsoft rates it "exploitation more likely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 30 supported Windows versions; a restart is required.
- This weekWindowsSeptember 8, 2026
CVE-2026-69890Windows Virtual Trusted Platform Module
Elevation of Privilege · Severity Critical · CVSS 7.5
In Windows Virtual Trusted Platform Module, an attacker who already has admin rights could take higher privileges once they can run code on the PC. Microsoft severity Critical, CVSS 7.5. 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.
- This weekWindowsSeptember 8, 2026
CVE-2026-72954Windows Deployment Services
Remote Code Execution · Severity Critical · 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 Critical, 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.
- This weekWindowsSeptember 8, 2026
CVE-2026-73017Graphics Kernel
Remote Code Execution · Severity Critical · CVSS 7.5
In Graphics Kernel, an attacker who already has admin rights could run their own code once they can run code on the PC. Microsoft severity Critical, 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.
- This weekWindowsSeptember 8, 2026
CVE-2026-81355Virtual Hard Disk (VHD) Miniport Driver
Remote Code Execution · Severity Critical · CVSS 7.5
In Virtual Hard Disk (VHD) Miniport Driver, an attacker who already has admin rights could run their own code once they can run code on the PC. Microsoft severity Critical, CVSS 7.5. 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.
- This weekWindowsSeptember 8, 2026
CVE-2026-68846Windows Kernel
Elevation of Privilege · Severity Important · CVSS 7.1
In Windows Kernel, an attacker with an ordinary user account could take higher privileges over the network, but only if someone opens a file, link or message. Microsoft severity Important, CVSS 7.1. Microsoft rates it "exploitation more likely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 30 supported Windows versions; a restart is required.
- This weekWindowsSeptember 8, 2026
CVE-2026-69274Windows Win32k
Elevation of Privilege · Severity Important · CVSS 7.1
In Windows Win32k, an attacker with an ordinary user account could take higher privileges over the network, but only if someone opens a file, link or message. Microsoft severity Important, CVSS 7.1. Microsoft rates it "exploitation more likely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 28 supported Windows versions; a restart is required.
- This weekWindowsSeptember 8, 2026
CVE-2026-69305Microsoft Windows Search Component
Elevation of Privilege · Severity Important · CVSS 7.1
In Microsoft Windows Search Component, an attacker with an ordinary user account could take higher privileges over the network, but only if someone opens a file, link or message. Microsoft severity Important, CVSS 7.1. Microsoft rates it "exploitation more likely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 30 supported Windows versions; a restart is required.
- This weekWindowsSeptember 8, 2026
CVE-2026-69337Windows Registry
Elevation of Privilege · Severity Important · CVSS 7.1
In Windows Registry, an attacker with an ordinary user account could take higher privileges over the network, but only if someone opens a file, link or message. Microsoft severity Important, CVSS 7.1. Microsoft rates it "exploitation more likely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 30 supported Windows versions; a restart is required.
- This weekWindowsSeptember 8, 2026
CVE-2026-69364Windows Print Spooler Components
Elevation of Privilege · Severity Important · CVSS 7.1
In Windows Print Spooler Components, an attacker with an ordinary user account could take higher privileges over the network, but only if someone opens a file, link or message. Microsoft severity Important, CVSS 7.1. Microsoft rates it "exploitation more likely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 30 supported Windows versions; a restart is required.
- This weekWindowsSeptember 8, 2026
CVE-2026-69451Windows Management Instrumentation
Elevation of Privilege · Severity Important · CVSS 7.1
In Windows Management Instrumentation, an attacker with an ordinary user account could take higher privileges over the network, but only if someone opens a file, link or message. Microsoft severity Important, CVSS 7.1. Microsoft rates it "exploitation more likely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 30 supported Windows versions; a restart is required.
- This weekWindowsSeptember 8, 2026
CVE-2026-69460Windows Modern Device Management (MDM)
Elevation of Privilege · Severity Important · CVSS 7.1
In Windows Modern Device Management (MDM), an attacker with an ordinary user account could take higher privileges over the network, but only if someone opens a file, link or message. Microsoft severity Important, CVSS 7.1. Microsoft rates it "exploitation more likely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 22 supported Windows versions; a restart is required.
- This weekWindowsSeptember 8, 2026
CVE-2026-69757Windows TCP/IP
Elevation of Privilege · Severity Important · CVSS 7.1
In Windows TCP/IP, an attacker with an ordinary user account could take higher privileges over the network, but only if someone opens a file, link or message. Microsoft severity Important, CVSS 7.1. Microsoft rates it "exploitation more likely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 22 supported Windows versions; a restart is required.
- This weekWindowsSeptember 8, 2026
CVE-2026-68884Windows Kernel
Elevation of Privilege · Severity Important · CVSS 7
In Windows Kernel, an attacker with an ordinary user account could take higher privileges once they can run code on the PC. Microsoft severity Important, CVSS 7.0. Microsoft rates it "exploitation more likely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 26 supported Windows versions; a restart is required.
- This weekWindowsSeptember 8, 2026
CVE-2026-69310Windows DNS
Elevation of Privilege · Severity Important · CVSS 7
In Windows DNS, an attacker with an ordinary user account could take higher privileges once they can run code on the PC. Microsoft severity Important, CVSS 7.0. Microsoft rates it "exploitation more likely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 28 supported Windows versions; a restart is required.
- This weekWindowsSeptember 8, 2026
CVE-2026-69385Windows TCP/IP
Elevation of Privilege · Severity Important · CVSS 7
In Windows TCP/IP, an attacker with an ordinary user account could take higher privileges once they can run code on the PC. Microsoft severity Important, CVSS 7.0. Microsoft rates it "exploitation more likely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 30 supported Windows versions; a restart is required.
- This weekWindowsSeptember 8, 2026
CVE-2026-69466Windows Kernel
Elevation of Privilege · Severity Important · CVSS 7
In Windows Kernel, an attacker with an ordinary user account could take higher privileges once they can run code on the PC. Microsoft severity Important, CVSS 7.0. Microsoft rates it "exploitation more likely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 30 supported Windows versions; a restart is required.
- This weekWindowsSeptember 8, 2026
CVE-2026-69473Windows Kernel
Elevation of Privilege · Severity Important · CVSS 7
In Windows Kernel, an attacker with an ordinary user account could take higher privileges once they can run code on the PC. Microsoft severity Important, CVSS 7.0. Microsoft rates it "exploitation more likely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 30 supported Windows versions; a restart is required.
- This weekWindowsSeptember 8, 2026
CVE-2026-69501Windows Secure Kernel Mode
Elevation of Privilege · Severity Critical · CVSS 7
In Windows Secure Kernel Mode, an attacker with an ordinary user account could take higher privileges once they can run code on the PC. Microsoft severity Critical, CVSS 7.0. 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.
- This weekWindowsSeptember 8, 2026
CVE-2026-69600Microsoft Windows Search Component
Elevation of Privilege · Severity Important · CVSS 7
In Microsoft Windows Search Component, an attacker with an ordinary user account could take higher privileges once they can run code on the PC. Microsoft severity Important, CVSS 7.0. Microsoft rates it "exploitation more likely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 30 supported Windows versions; a restart is required.
- This weekWindowsSeptember 8, 2026
CVE-2026-69605Microsoft Install Service
Elevation of Privilege · Severity Important · CVSS 7
In Microsoft Install Service, an attacker with an ordinary user account could take higher privileges once they can run code on the PC. Microsoft severity Important, CVSS 7.0. Microsoft rates it "exploitation more likely". Fixed in the September 2026 Windows security update (KB5122871, KB5122878, KB5122880) for 18 supported Windows versions; a restart is required.
- This weekWindowsSeptember 8, 2026
CVE-2026-69779Windows Win32k
Elevation of Privilege · Severity Important · CVSS 7
In Windows Win32k, an attacker with an ordinary user account could take higher privileges once they can run code on the PC. Microsoft severity Important, CVSS 7.0. Microsoft rates it "exploitation more likely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 30 supported Windows versions; a restart is required.
- This weekWindowsSeptember 8, 2026
CVE-2026-69911Microsoft Windows Search Component
Elevation of Privilege · Severity Important · CVSS 7
In Microsoft Windows Search Component, an attacker with an ordinary user account could take higher privileges once they can run code on the PC. Microsoft severity Important, CVSS 7.0. Microsoft rates it "exploitation more likely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 30 supported Windows versions; a restart is required.
- This weekWindowsSeptember 8, 2026
CVE-2026-70562Windows Audio Service
Elevation of Privilege · Severity Important · CVSS 7
In Windows Audio Service, an attacker with an ordinary user account could take higher privileges once they can run code on the PC. Microsoft severity Important, CVSS 7.0. Microsoft rates it "exploitation more likely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 30 supported Windows versions; a restart is required.
- This weekWindowsSeptember 8, 2026
CVE-2026-70585Windows Services for NFS ONCRPC XDR Driver
Remote Code Execution · Severity Critical · CVSS 7
In Windows Services for NFS ONCRPC XDR Driver, an attacker with an ordinary user account could run their own code once they can run code on the PC. Microsoft severity Critical, CVSS 7.0. Microsoft rates it "exploitation more likely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122882) for 12 supported Windows versions; a restart is required.
- This weekWindowsSeptember 8, 2026
CVE-2026-71340Windows File History Service
Elevation of Privilege · Severity Important · CVSS 7
In Windows File History Service, an attacker with an ordinary user account could take higher privileges once they can run code on the PC. Microsoft severity Important, CVSS 7.0. Microsoft rates it "exploitation more likely". Fixed in the September 2026 Windows security update (KB5122876, KB5122878, KB5122880) for 22 supported Windows versions; a restart is required.
- This weekWindowsSeptember 8, 2026
CVE-2026-80093Windows Cloud Files Mini Filter Driver
Elevation of Privilege · Severity Important · CVSS 7
In Windows Cloud Files Mini Filter Driver, an attacker with an ordinary user account could take higher privileges once they can run code on the PC. Microsoft severity Important, CVSS 7.0. Microsoft rates it "exploitation more likely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 22 supported Windows versions; a restart is required.
- This weekWindowsSeptember 29, 2026
CVE-2026-50375DirectX Graphics Kernel
Elevation of Privilege · Severity Important · CVSS 6.3 · Fixed earlier (July 2026)
In DirectX Graphics Kernel, an attacker with an ordinary user account could take higher privileges once they can run code on the PC. Microsoft severity Important, CVSS 6.3. Microsoft rates it "exploitation more likely". Microsoft disclosed it on September 29, 2026, but the fix had already shipped in the July 2026 Windows security update (KB5099536, KB5099538, KB5099539) for 19 supported Windows versions; a restart is required.
- This weekWindowsSeptember 8, 2026
CVE-2026-69723Windows Kernel
Information Disclosure · Severity Important · CVSS 5.7
In Windows Kernel, 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 more likely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 30 supported Windows versions; a restart is required.
- This weekWindowsSeptember 8, 2026
CVE-2026-69832Win32k
Information Disclosure · Severity Important · CVSS 5.6
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 5.6. Microsoft rates it "exploitation more likely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 30 supported Windows versions; a restart is required.
- This weekWindowsSeptember 8, 2026
CVE-2026-69406Windows Kernel
Information Disclosure · Severity Important · CVSS 5.5
In Windows Kernel, 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 more likely". Fixed in the September 2026 Windows security update (KB5122871, KB5122876, KB5122878) for 30 supported Windows versions; a restart is required.
- This weekWindowsSeptember 8, 2026
CVE-2026-78454Windows CD-ROM Driver
Information Disclosure · Severity Important · CVSS 5.5
In Windows CD-ROM 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 more likely". Fixed in the September 2026 Windows security update (KB5122876, KB5122878, KB5122880) for 22 supported Windows versions; a restart is required.
- This weekWindowsSeptember 8, 2026
CVE-2026-83501Windows Virtualization-Based Security (VBS)
Information Disclosure · Severity Critical · CVSS 5.5
In Windows Virtualization-Based Security (VBS), an attacker with an ordinary user account could read information they shouldn't see once they can run code on the PC. Microsoft severity Critical, CVSS 5.5. Microsoft rates it "exploitation more likely". Fixed in the September 2026 Windows security update (KB5122871, KB5122880, KB5124008) for 10 supported Windows versions; a restart is required.
- This weekWindowsSeptember 8, 2026
CVE-2026-72980Windows Hello
Security Feature Bypass · Severity Critical · CVSS 4.4
In Windows Hello, an attacker who already has admin rights could get around a Windows security protection once they can run code on the PC. Microsoft severity Critical, CVSS 4.4. 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.
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.