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MSRC compact vulnerability detail

CVE-2026-20853 · Windows WalletService Elevation of Privilege Vulnerability

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

Severity
Important
Impact
Elevation of Privilege
CVSS
7.4 base · 6.4 temporal
Release
2026-01-13
Signals
Windows WalletService Elevation of Privilege Exploited: No Publicly disclosed: No Exploitability: Exploitation Less Likely
CWE
CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Patch Diff
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Description
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows WalletService allows an unauthorized attacker to elevate privileges locally.
FAQ / Articles
Windows WalletService Elevation of Privilege Vulnerability
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows WalletService allows an unauthorized attacker to elevate privileges locally.
FAQ
According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability? Successful exploitation of this vulnerability requires an attacker to win a race condition.
FAQ
What privileges could be gained by an attacker who successfully exploited the vulnerability? An attacker who successfully exploited this vulnerability could gain the privileges of the compromised user.