Executive brief
A security vulnerability exists in the Windows File History Service, a component used to automatically back up user files. An attacker who already has basic access to a computer could exploit this flaw to gain full administrative control over the system. This could allow them to access sensitive data, install malicious software, or disrupt business operations.
Technical details
This vulnerability is classified as a stack-based buffer overflow (CWE-121) within the Windows File History Service. The flaw is triggered when the service improperly handles specific data inputs, leading to memory corruption. An attacker with low-privileged local access can exploit this to execute arbitrary code with elevated system privileges. The attack vector is local, requiring no user interaction, and affects multiple versions of Windows 10, Windows 11, and Windows Server. Microsoft has released security updates to address this issue.
Affected products
- Microsoft Windows 10 Version 1607 10.0.14393.0 to 10.0.14393.9339
- Microsoft Windows 10 Version 1809 10.0.17763.0 to 10.0.17763.9020
- Microsoft Windows 10 Version 21H2 10.0.19044.0 to 10.0.19044.7548
- Microsoft Windows 10 Version 22H2 10.0.19045.0 to 10.0.19045.7548
- Microsoft Windows 11 Version 24H2 10.0.26100.0 to 10.0.26100.8875
- Microsoft Windows Server 2016 10.0.14393.0 to 10.0.14393.9339
Timeline
- 2026-07-14: disclosed
- 2026-07-14: advisory