Exploit for Use After Free in Microsoft CVE-2026-42978

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

Published 9 Jun 2026Updated 23 Jul 20265 sources
CVSS 7.8 PoC CANDIDATE

What happened

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

Affected versions

Windows 10 Version 1809: 10.0.17763.0 through before 10.0.17763.8880 (custom); 10.0.19044.0 through before 10.0.19044.7417 (custom); 10.0.19045.0 through before 10.0.19045.7417 (custom); 10.0.22631.0 through before 10.0.22631.7219 (custom); 10.0.26100.0 through before 10.0.26100.8655 (custom); 10.0.26200.0 through before 10.0.26200.8655 (custom); 10.0.28000.0 through before 10.0.28000.2269 (custom); 10.0.20348.0 through before 10.0.20348.5256 (custom); 10.0.26100.0 through before 10.0.26100.32995 (custom) Fixed: See vendor advisory.

Why it matters

This source correlation may provide earlier visibility while structured CVE metadata is still being updated.

Detection & mitigation

  • Review the original advisory and validate affected versions.
  • Apply vendor-provided updates or mitigations when available.

Public PoC references