CVE-2026-42900 Microsoft Windows App Store Elevation of Privilege Vulnerability
An attacker can exploit a race condition in the Windows App Store to elevate privileges over the network.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-42900?
CVE-2026-42900 is a high-severity vulnerability in Microsoft Windows 10 1607, published on 14 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows App Store allows an unauthorized attacker to elevate privileges over a network.
Which versions are affected by CVE-2026-42900?
It affects 11 products.
Products include Microsoft Windows 10 1607, Microsoft Windows 10 1809, Microsoft Windows 10 21h2, Microsoft Windows 10 22h2, Microsoft Windows 11 24h2, Microsoft Windows 11 25h2 and 5 more.
How do I fix CVE-2026-42900?
No fix has been published for CVE-2026-42900 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-42900 being exploited?
There is no known exploitation of CVE-2026-42900 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Windows 10 1607
- CVE-2026-33824 Microsoft Internet Key Exchange (IKE) Service Extensions Double Free
- CVE-2026-21510 Microsoft Windows Shell Protection Mechanism Failure
- CVE-2026-21513 Microsoft MSHTML Framework Protection Mechanism Failure
- CVE-2023-32049 Microsoft Windows Defender SmartScreen Security Feature Bypass
- CVE-2023-29360 Microsoft Streaming Service Untrusted Pointer Dereference
Sources
Also known as GHSA-mcvx-hvv7-4q3h.