Use After Free in Microsoft 365 Copilot
CVE-2025-26687
Use after free in Windows Win32K - GRFX allows an unauthorized attacker to elevate privileges over a network.
Vulnerability class: Use-After-Free
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.011 (65.1th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 65th percentile — 65.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: +0.001
Affected products
- Microsoft 365 Copilot
- Microsoft Office For Android — versions 16.0.1
- Microsoft Office For Universal — versions 16.0.1
- Microsoft Office
- Microsoft Windows 10 1507
- Microsoft Windows 10 1607
- Microsoft Windows 10 1809
- Microsoft Windows 10 21h2
- Microsoft Windows 10 22h2
- Microsoft Windows 10 Version 1507 — versions 10.0.10240.0
Weakness classification (CWE)
References
- Win32k Elevation of Privilege Vulnerability (vendor-advisory, patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2025-26687?
- CVE-2025-26687 is a high-severity vulnerability in Microsoft 365 Copilot, classified under Use After Free. CVSS score: 7.5/10. Published 2025-04-08.
- How severe is CVE-2025-26687?
- High severity. CVSS v3 base score is 7.5 out of 10.