Vulnerability details

CVE-2026-20853

Microsoft Windows 10Microsoft Windows 11

Windows WalletService Elevation of Privilege Vulnerability

CVSS 3.1

7.4High

Official description

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

CVSS scores

Score	Version	Source	Vector
7.4High	3.1	CVEProject cvelistV5 (CNA) (microsoft)	`CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C`

Affected products

Vendor	Product	Versions	Source
Microsoft	Windows 10 Version 1607	10.0.14393.0 ≤ v < 10.0.14393.8783	CVEProject cvelistV5 (CNA)
Microsoft	Windows 10 Version 1809	10.0.17763.0 ≤ v < 10.0.17763.8276	CVEProject cvelistV5 (CNA)
Microsoft	Windows 10 Version 21H2	10.0.19044.0 ≤ v < 10.0.19044.6809	CVEProject cvelistV5 (CNA)
Microsoft	Windows 10 Version 22H2	10.0.19045.0 ≤ v < 10.0.19045.6809	CVEProject cvelistV5 (CNA)
Microsoft	Windows 11 Version 24H2	10.0.26100.0 ≤ v < 10.0.26100.7623	CVEProject cvelistV5 (CNA)
Microsoft	Windows 11 Version 25H2	10.0.26200.0 ≤ v < 10.0.26200.7623	CVEProject cvelistV5 (CNA)
Microsoft	Windows 11 version 23H2	10.0.22631.0 ≤ v < 10.0.22631.6491	CVEProject cvelistV5 (CNA)
Microsoft	Windows 11 version 23H2	10.0.22631.0 ≤ v < 10.0.22631.6491	CVEProject cvelistV5 (CNA)

References and advisories

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20853 vendor-advisorypatch

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Details

Published: 2026-01-13
Last updated: 2026-07-31
State: Published
Assigner (CNA): microsoft

Exploit prediction (EPSS)

0.31%

Probability of exploitation in 30 days

24.4%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: No
Exploitation: None
Technical impact: Total

Weaknesses (CWE)

CWE-362
Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')