Privilege escalation via Win32K stack buffer overflow
Published Sep 8, 2026 · Updated Sep 10, 2026
Stack-based buffer overflow in Microsoft Windows Win32K allows remote authenticated users to elevate privileges through network input. Microsoft has not disclosed the affected Win32K routine, the network input that reaches it, or how that input exceeds a stack buffer. Exploitation requires existing low-level privileges and user interaction and grants high-impact control over the affected system.
Summary
What happened
Stack-based buffer overflow in Microsoft Windows Win32K allows remote authenticated users to elevate privileges through network input. Microsoft has not disclosed the affected Win32K routine, the network input that reaches it, or how that input exceeds a stack buffer. Exploitation requires existing low-level privileges and user interaction and grants high-impact control over the affected system.
The record
- CVE
- CVE-2026-69301
- Published
- Sep 8, 2026
- Updated
- Sep 10, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- CWE-121, T1068
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 8, 2026CVE publishedPublication date reported by the CVE source.
- Sep 10, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
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
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo