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Description

Time-of-check time-of-use (TOCTOU) race condition in Program Compatibility Assistant Service allows an authorized attacker to elevate privileges locally.

PUBLISHED Reserved 2026-05-12 | Published 2026-06-09 | Updated 2026-06-10 | Assigner microsoft




HIGH: 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Problem types

CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition

Product status

10.0.19044.0 (custom) before 10.0.19044.7417
affected

10.0.19045.0 (custom) before 10.0.19045.7417
affected

10.0.22631.0 (custom) before 10.0.22631.7219
affected

10.0.22631.0 (custom) before 10.0.22631.7219
affected

10.0.26100.0 (custom) before 10.0.26100.8655
affected

10.0.26200.0 (custom) before 10.0.26200.8655
affected

10.0.28000.0 (custom) before 10.0.28000.2269
affected

10.0.20348.0 (custom) before 10.0.20348.5256
affected

10.0.26100.0 (custom) before 10.0.26100.32995
affected

10.0.26100.0 (custom) before 10.0.26100.32995
affected

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45487 (Windows Program Compatibility Assistant Service Elevation of Privilege Vulnerability) vendor-advisory patch

cve.org (CVE-2026-45487)

nvd.nist.gov (CVE-2026-45487)

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