Privilege escalation via undisclosed heap buffer overflow
Published Sep 8, 2026 · Updated Sep 9, 2026
Heap-based buffer overflow in Windows Hello on affected Windows releases allows local users with administrative privileges to elevate privileges. Microsoft has not disclosed the affected function, attacker-controlled input, or bounds error that causes heap memory to be overwritten. Exploitation requires local access and high privileges; success crosses a security boundary and compromises the affected system.
Summary
What happened
Heap-based buffer overflow in Windows Hello on affected Windows releases allows local users with administrative privileges to elevate privileges. Microsoft has not disclosed the affected function, attacker-controlled input, or bounds error that causes heap memory to be overwritten. Exploitation requires local access and high privileges; success crosses a security boundary and compromises the affected system.
The record
- CVE
- CVE-2026-81354
- Published
- Sep 8, 2026
- Updated
- Sep 9, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- CWE-122, T1068
- Attack vector
- local
- Privileges
- admin
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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