Privilege escalation via biometric-service heap overflow
Published Sep 8, 2026 · Updated Sep 9, 2026
Heap-based buffer overflow in Microsoft Windows Biometric Service allows local users to elevate privileges through crafted local input. The public Microsoft record identifies the service and overflow class but does not disclose the affected function, buffer, or unchecked copy operation. Exploitation requires prior local authorization; success raises privileges on the affected Windows host, while no remote path is reported.
Summary
What happened
Heap-based buffer overflow in Microsoft Windows Biometric Service allows local users to elevate privileges through crafted local input. The public Microsoft record identifies the service and overflow class but does not disclose the affected function, buffer, or unchecked copy operation. Exploitation requires prior local authorization; success raises privileges on the affected Windows host, while no remote path is reported.
The record
- CVE
- CVE-2026-83987
- Published
- Sep 8, 2026
- Updated
- Sep 9, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- 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
No CVSS assessment is available in this record.
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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