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CVE-2026-20853 Microsoft CVE debrief

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-01-13T18:16:13.990Z and has not been modified since then. CVE-2026-20853 is a race condition vulnerability in the Windows WalletService that allows an unauthorized attacker to elevate privileges locally. The vulnerability has a CVSS score of 7.4 and is classified as HIGH severity. Affected versions include Windows 10 1607, 1809, 21H2, 22H2, Windows 11 23H2, 24H2, and 25H2. Microsoft has provided a vendor advisory for mitigation. System administrators and security teams responsible for Windows systems, especially those using affected versions of Windows 10 and Windows 11, should be aware of this vulnerability and take necessary actions to mitigate it.

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
HIGH 7.4
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 systems, especially those using affected versions of Windows 10 and Windows 11.

Technical summary

CVE-2026-20853 is a race condition vulnerability in the Windows WalletService that allows an unauthorized attacker to elevate privileges locally. The vulnerability has a CVSS score of 7.4 and is classified as HIGH severity. Affected versions include Windows 10 1607, 1809, 21H2, 22H2, Windows 11 23H2, 24H2, and 25H2. Microsoft has provided a vendor advisory for mitigation.

Defensive priority

This vulnerability allows an unauthorized attacker to elevate privileges locally, which is a high-risk impact. Affected Windows versions include Windows 10, Windows 11, and their respective updates. Apply vendor patches immediately.

Recommended defensive actions

  • Apply patches from Microsoft for the affected Windows versions.
  • Ensure all Windows systems are updated with the latest security patches.
  • Monitor systems for unusual activity that could indicate exploitation attempts.

Evidence notes

The CVE-2026-20853 record indicates a race condition vulnerability in Windows WalletService that allows local privilege escalation. The vulnerability has a CVSS score of 7.4 and is classified as HIGH severity. Affected versions include Windows 10 1607, 1809, 21H2, 22H2, Windows 11 23H2, 24H2, and 25H2. Microsoft has provided a vendor advisory for mitigation.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-01-13T18:16:13.990Z and has not been modified since then.