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 higher-level administrative privileges. This could allow them to take full control of the system, access sensitive data, or disrupt operations.
Technical details
A race condition (CWE-362) exists in the Windows Runtime due to improper synchronization when accessing shared resources. The vulnerability requires a local attacker to have basic user privileges (PR:L) and involves a high level of complexity (AC:H) to successfully time the exploit. If successful, the attacker can achieve local privilege escalation, gaining full confidentiality, integrity, and availability impact on the affected system. Microsoft has released security updates to address this issue across affected versions of Windows 11 and Windows Server 2025.
Affected products
- Microsoft Windows 11 Version 24H2 10.0.26100.0 to 10.0.26100.8875
- Microsoft Windows 11 Version 25H2 10.0.26200.0 to 10.0.26200.8875
- Microsoft Windows 11 version 26H1 10.0.28000.0 to 10.0.28000.2269
- Microsoft Windows Server 2025 10.0.26100.0 to 10.0.26100.33158
Timeline
- 2026-07-14: disclosed
- 2026-07-14: advisory