Privilege Elevation Vulnerability in Capability Access Management Service by Microsoft
CVE-2026-21221

7HIGH

Key Information:

Vendor

Microsoft
Status
Windows Server 2025 (server Core Installation)
Windows 11 Version 25h2
Windows 11 Version 24h2
Windows Server 2025
Vendor
CVE Published:
13 January 2026

What is CVE-2026-21221?

An elevation of privilege vulnerability exists in the Capability Access Management Service (camsvc) that allows an authorized attacker to exploit concurrent execution involving shared resources due to improper synchronization. This flaw can lead to privilege escalation on affected systems. Users are advised to consult the latest vendor advisories for remediation steps and to apply necessary patches to protect their systems.

Affected Version(s)

Windows 11 Version 24H2 ARM64-based Systems 10.0.26100.0 < 10.0.26100.32230

Windows 11 Version 25H2 10.0.26200.0 < 10.0.26200.7623

Windows Server 2025 (Server Core installation) x64-based Systems 10.0.26100.0 < 10.0.26100.7623

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisorypatch

CVSS V3.1

Score:
7
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
High
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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