Local privilege escalation via heap buffer overflow
Published Sep 8, 2026 · Updated Sep 9, 2026
Heap-based buffer overflow in Windows Biometric Service on affected Windows releases allows local users to elevate privileges. Microsoft identifies the service and heap-overwrite class but has not disclosed the input path, vulnerable routine, or failed bounds operation. Successful exploitation requires prior local low-privileged access, requires no user interaction, and grants higher privileges on the host.
Summary
What happened
Heap-based buffer overflow in Windows Biometric Service on affected Windows releases allows local users to elevate privileges. Microsoft identifies the service and heap-overwrite class but has not disclosed the input path, vulnerable routine, or failed bounds operation. Successful exploitation requires prior local low-privileged access, requires no user interaction, and grants higher privileges on the host.
The record
- CVE
- CVE-2026-83955
- Published
- Sep 8, 2026
- Updated
- Sep 9, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- CWE-122, 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=10.0.17763.0 <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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