Executive brief
A security vulnerability exists in the Windows Runtime, a core component of the Windows operating system used by modern applications. 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 view sensitive data, install malicious software, or disrupt business operations.
Technical details
This vulnerability is classified as a race condition (CWE-362) leading to a use-after-free (CWE-416) scenario within the Windows Runtime (WinRT). The flaw occurs due to improper synchronization when multiple threads access a shared resource concurrently. An attacker with low-privileged local access can exploit this timing issue to execute code with elevated privileges. The vulnerability affects multiple versions of Windows 10, Windows 11, and Windows Server. Microsoft has released security updates to address this issue by improving resource synchronization.
Affected products
- 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 2019 10.0.17763.0 to 10.0.17763.9020
- Microsoft Windows Server 2022 10.0.20348.0 to 10.0.20348.5386
Timeline
- 2026-07-14: advisory: Microsoft published the security advisory and NVD record.
- 2026-07-14: patched: Security updates were made available for affected Windows versions.