Privilege elevation via Win32K out-of-bounds read
Published Sep 8, 2026 · Updated Sep 9, 2026
Out-of-bounds read in Win32K in Microsoft Windows allows remote authenticated users to elevate privileges through crafted network input. Win32K reads beyond a memory buffer boundary while processing attacker-controlled input; Microsoft has not identified the affected routine or object. Exploitation requires low-privilege access and user interaction, and successful exploitation grants elevated Windows privileges.
Summary
What happened
Out-of-bounds read in Win32K in Microsoft Windows allows remote authenticated users to elevate privileges through crafted network input. Win32K reads beyond a memory buffer boundary while processing attacker-controlled input; Microsoft has not identified the affected routine or object. Exploitation requires low-privilege access and user interaction, and successful exploitation grants elevated Windows privileges.
The record
- CVE
- CVE-2026-69689
- Published
- Sep 8, 2026
- Updated
- Sep 9, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- CWE-121, CWE-125, T1068
- Attack vector
- network
- 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=10.0.17763.0 <10.0.17763.9245
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.
Weakness, pattern, technique
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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