Advisoriesby IbisMicrosoftCVE-2026-42900
Microsoft Windows App Store: race condition
Fix: upgrade to 10.0.14393.9339 or later (8 fixed versions below)
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows App Store allows an unauthorized attacker to elevate privileges over a network.
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| Windows 10 Version 1607 Product | >= 10.0.14393.0, < 10.0.14393.9339 | 10.0.14393.9339 |
| Windows 10 Version 1809 Product | >= 10.0.17763.0, < 10.0.17763.9020 | 10.0.17763.9020 |
| Windows 10 Version 21H2 Product | >= 10.0.19044.0, < 10.0.19044.7548 | 10.0.19044.7548 |
| Windows 10 Version 22H2 Product | >= 10.0.19045.0, < 10.0.19045.7548 | 10.0.19045.7548 |
| Windows 11 Version 24H2 Product | >= 10.0.26100.0, < 10.0.26100.8875 | 10.0.26100.8875 |
| Windows 11 Version 25H2 Product | >= 10.0.26200.0, < 10.0.26200.8875 | 10.0.26200.8875 |
| Windows 11 version 26H1 Product | >= 10.0.28000.0, < 10.0.28000.2525 | 10.0.28000.2525 |
| Windows Server 2016 Product | >= 10.0.14393.0, < 10.0.14393.9339 | 10.0.14393.9339 |
| Windows Server 2016 (Server Core installation) Product | >= 10.0.14393.0, < 10.0.14393.9339 | 10.0.14393.9339 |
| Windows Server 2019 Product | >= 10.0.17763.0, < 10.0.17763.9020 | 10.0.17763.9020 |
| Windows Server 2019 (Server Core installation) Product | >= 10.0.17763.0, < 10.0.17763.9020 | 10.0.17763.9020 |
| Windows Server 2022 Product | >= 10.0.20348.0, < 10.0.20348.5386 | 10.0.20348.5386 |