CVE-2026-27907 Windows Storage Spaces Controller Elevation of Privilege Vulnerability
An integer underflow in Windows Storage Spaces allows local attackers to elevate privileges, requiring patches for Windows 11 and Server.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-27907?
CVE-2026-27907 is a high-severity vulnerability in Microsoft Windows 11 23h2, published on 14 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Integer underflow (wrap or wraparound) in Windows Storage Spaces Controller allows an authorized attacker to elevate privileges locally.
Weakness: CWE-191
Which versions are affected by CVE-2026-27907?
It affects 6 products.
Products include Microsoft Windows 11 23h2, Microsoft Windows 11 24h2, Microsoft Windows 11 25h2, Microsoft Windows 11 26h1, Microsoft Windows Server 2022 23h2, Microsoft Windows Server 2025.
How do I fix CVE-2026-27907?
No fix has been published for CVE-2026-27907 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-27907 being exploited?
There is no known exploitation of CVE-2026-27907 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Windows 11 23h2
- CVE-2026-81963 Microsoft Windows Link Following
- CVE-2026-100219 Microsoft QUIC Remote Code Execution Vulnerability
- CVE-2026-96909 Windows BitLocker Remote Code Execution Vulnerability
- CVE-2026-62815 Microsoft QUIC Remote Code Execution Vulnerability
- CVE-2026-45657 Windows Kernel Remote Code Execution Vulnerability
Sources
Also known as GHSA-p98g-6f6c-423f.