Executive brief
A security vulnerability has been identified in the Windows Overlay Filter, a component of the Windows operating system. 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 files, install malicious software, or disrupt business operations.
Technical details
A local privilege escalation vulnerability exists in the Windows Overlay Filter due to a buffer over-read and potential integer overflow (CWE-126, CWE-190). An attacker with low-privileged local access can exploit this flaw to execute code with elevated system privileges. The attack vector is local and requires no user interaction. Microsoft has released security updates to address this issue across affected versions of Windows 10, Windows 11, and Windows Server 2012 R2.
Affected products
- Microsoft Windows 10 1607, 1809, 21H2, 22H2
- Microsoft Windows 11 24H2, 25H2, 26H1
- Microsoft Windows Server 2012 R2 All versions
Timeline
- 2026-07-14: advisory: Microsoft published the security advisory.
- 2026-07-14: patched: Security updates released by Microsoft.