Local privilege escalation via out-of-bounds read
Published Sep 8, 2026 · Updated Sep 9, 2026
An out-of-bounds read in Microsoft Windows ReFS on affected Windows 11 and Server builds allows local users to elevate privileges. Microsoft identifies the Resilient File System as the affected component but has not published the specific code path or malformed input that causes the read beyond a buffer boundary. Exploitation requires local low-privileged access and high-complexity conditions; successful exploitation grants elevated privileges.
Summary
What happened
An out-of-bounds read in Microsoft Windows ReFS on affected Windows 11 and Server builds allows local users to elevate privileges. Microsoft identifies the Resilient File System as the affected component but has not published the specific code path or malformed input that causes the read beyond a buffer boundary. Exploitation requires local low-privileged access and high-complexity conditions; successful exploitation grants elevated privileges.
The record
- CVE
- CVE-2026-69617
- Published
- Sep 8, 2026
- Updated
- Sep 9, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2025 (Server Core installation)
- Classifications
- CWE-125, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 8, 2026CVE publishedPublication date reported by the CVE source.
- Sep 9, 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=10.0.26100.0 <10.0.26100.33438
What conditions does exploitation require?
What is affected?
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.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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