CVE-2026-21221 Capability Access Management Service (camsvc) Elevation of Privilege Vulnerability
A race condition in the Windows Capability Access Management Service allows local attackers 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-2026-21221?
CVE-2026-21221 is a high-severity vulnerability in Microsoft Windows 11 24h2, published on 13 Jan 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Concurrent execution using shared resource with improper synchronization ('race condition') in Capability Access Management Service (camsvc) allows an authorized attacker to elevate privileges locally.
Which versions are affected by CVE-2026-21221?
It affects 3 products.
Products include Microsoft Windows 11 24h2, Microsoft Windows 11 25h2, Microsoft Windows Server 2025.
How do I fix CVE-2026-21221?
No fix has been published for CVE-2026-21221 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-21221 being exploited?
There is no known exploitation of CVE-2026-21221 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Windows 11 24h2
- CVE-2025-60710 Microsoft Windows Link Following
- CVE-2026-54990 Remote Desktop Client Remote Code Execution Vulnerability
- CVE-2025-50165 Windows Graphics Component Remote Code Execution Vulnerability
- CVE-2025-21311 Windows NTLM V1 Elevation of Privilege Vulnerability
- CVE-2026-108463 Windows SmartScreen Security Feature Bypass Vulnerability
Sources
Also known as GHSA-f2rm-crh3-7xrr.