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HIGH · 7.4

CVE-2026-20853

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows WalletService allows an unauthorized attacker to elevate privileges locally.

Vulnerability Description

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows WalletService allows an unauthorized attacker to elevate privileges locally.

CVSS Score

7.4

HIGH

CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH

Affected Products

VendorProductVersions
MicrosoftWindows 10 1607< 10.0.14393.8783
MicrosoftWindows 10 1809< 10.0.17763.8276
MicrosoftWindows 10 21H2< 10.0.19044.6809
MicrosoftWindows 10 22H2< 10.0.19045.6809
MicrosoftWindows 11 23H2< 10.0.22631.6491
MicrosoftWindows 11 24H2< 10.0.26100.7623
MicrosoftWindows 11 25H2< 10.0.26200.7623

Related Weaknesses (CWE)

CWE-362

References

FAQ

What is CVE-2026-20853?

CVE-2026-20853 is a vulnerability with a CVSS score of 7.4 (HIGH). Concurrent execution using shared resource with improper synchronization ('race condition') in Windows WalletService allows an unauthorized attacker to elevate privileges locally.

How severe is CVE-2026-20853?

CVE-2026-20853 has been rated HIGH with a CVSS base score of 7.4/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-20853?

Check the references section above for vendor advisories and patch information. Affected products include: Microsoft Windows 10 1607, Microsoft Windows 10 1809, Microsoft Windows 10 21H2, Microsoft Windows 10 22H2, Microsoft Windows 11 23H2.