CVE-2026-45487 Windows Program Compatibility Assistant Service Elevation of Privilege Vulnerability
A local attacker can exploit a race condition in the Windows Program Compatibility Assistant Service to elevate privileges.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-45487?
CVE-2026-45487 is a high-severity vulnerability in Microsoft Windows 10 21h2, published on 9 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Time-of-check time-of-use (TOCTOU) race condition in Program Compatibility Assistant Service allows an authorized attacker to elevate privileges locally.
Weakness: CWE-367
Which versions are affected by CVE-2026-45487?
It affects 8 products.
Products include Microsoft Windows 10 21h2, Microsoft Windows 10 22h2, Microsoft Windows 11 23h2, Microsoft Windows 11 24h2, Microsoft Windows 11 25h2, Microsoft Windows 11 26h1 and 2 more.
How do I fix CVE-2026-45487?
No fix has been published for CVE-2026-45487 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-45487 being exploited?
There is no known exploitation of CVE-2026-45487 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Windows 10 21h2
- CVE-2025-21333 Microsoft Windows Hyper-V NT Kernel Integration VSP Heap-based Buffer Overflow
- CVE-2025-21334 Microsoft Windows Hyper-V NT Kernel Integration VSP Use-After-Free
- CVE-2025-21335 Microsoft Windows Hyper-V NT Kernel Integration VSP Use-After-Free
- CVE-2026-42904 Windows TCP/IP Elevation of Privilege Vulnerability
- CVE-2026-105733 Windows Hyper-V Remote Code Execution Vulnerability
Sources
Also known as GHSA-fj7f-jv57-m7jh.