Unauthenticated privilege escalation via GRFX use-after-free
Published Apr 8, 2025 · Updated Aug 10, 2026
A use-after-free in Microsoft Windows Win32K GRFX allows remote attackers to elevate privileges through malicious content. Microsoft identifies the GRFX component but has not disclosed the freed object, stale reference, or operation that reuses it. Exploitation is unauthenticated and network-delivered but requires user interaction; successful exploitation grants elevated privileges.
Summary
What happened
A use-after-free in Microsoft Windows Win32K GRFX allows remote attackers to elevate privileges through malicious content. Microsoft identifies the GRFX component but has not disclosed the freed object, stale reference, or operation that reuses it. Exploitation is unauthenticated and network-delivered but requires user interaction; successful exploitation grants elevated privileges.
The record
- CVE
- CVE-2025-26687
- Published
- Apr 8, 2025
- Updated
- Aug 10, 2026
- Vendor
- Microsoft
- Product
- Windows 10 Version 1507
- Classifications
- CWE-416, T1068
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 8, 2025CVE publishedPublication date reported by the CVE source.
- Aug 10, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=10.0.10240.0 <10.0.10240.20978
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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