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CVE-2026-20815 Microsoft CVE debrief

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-01-13T18:16:08.273Z and has not been modified since then. CVE-2026-20815 is a race condition vulnerability in the Capability Access Management Service (camsvc) that allows an authorized attacker to elevate privileges locally. The vulnerability has a CVSS score of 7 and is classified as HIGH severity. Affected products include Windows 11 24H2, Windows 11 25H2, and Windows Server 2025. The vulnerability is caused by improper synchronization of shared resources, allowing an attacker to exploit the condition to gain elevated privileges. System administrators and security teams responsible for Windows 11 and Windows Server 2025 systems should be aware of this vulnerability and take immediate action to patch or mitigate the risk. This vulnerability allows an authorized attacker to elevate privileges locally, indicating a high risk for systems with local access. Immediate patching is recommended.

Vendor
Microsoft
Product
Windows 11 Version 24H2
CVSS
HIGH 7
CISA KEV
Not listed in stored evidence
Original CVE published
2026-01-13
Original CVE updated
2026-07-30
Advisory published
2026-01-13
Advisory updated
2026-07-30

Who should care

System administrators and security teams responsible for Windows 11 and Windows Server 2025 systems should be aware of this vulnerability and take immediate action to patch or mitigate the risk.

Technical summary

CVE-2026-20815 is a race condition vulnerability in the Capability Access Management Service (camsvc) that allows an authorized attacker to elevate privileges locally. The vulnerability has a CVSS score of 7 and is classified as HIGH severity. Affected products include Windows 11 24H2, Windows 11 25H2, and Windows Server 2025. The vulnerability is caused by improper synchronization of shared resources, allowing an attacker to exploit the condition to gain elevated privileges.

Defensive priority

This vulnerability allows an authorized attacker to elevate privileges locally, indicating a high risk for systems with local access. Immediate patching is recommended.

Recommended defensive actions

  • Apply patches or updates provided by the vendor to address the vulnerability.
  • Conduct a thorough inventory of systems and apply compensating controls where patching is not immediately feasible.
  • Monitor systems for suspicious activity that could indicate exploitation attempts.

Evidence notes

The CVE-2026-20815 record indicates a race condition vulnerability in the Capability Access Management Service (camsvc) that allows an authorized attacker to elevate privileges locally. The vulnerability has a CVSS score of 7 and is classified as HIGH severity. Affected products include Windows 11 24H2, Windows 11 25H2, and Windows Server 2025.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-20815 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-20815

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-20815 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-20815

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.