# CVE-2026-83978

## Summary

- **CVE ID:** CVE-2026-83978
- **Severity:** HIGH
- **CVSS Score:** 7.8 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C)
- **CWE:** CWE-122
- **Published:** Sep 8, 2026
- **Last Modified:** Sep 9, 2026

## Description

Heap-based buffer overflow in Windows Biometric Service allows an authorized attacker to elevate privileges locally.

## Affected Products

- Microsoft — Windows 10 Version 1607 (10.0.14393.0)
- Microsoft — Windows 10 Version 1809 (10.0.17763.0)
- Microsoft — Windows 10 Version 21H2 (10.0.19044.0)
- Microsoft — Windows 10 Version 22H2 (10.0.19045.0)
- Microsoft — Windows 11 version 23H2 (10.0.22631.0)
- Microsoft — Windows 11 Version 23H2 (10.0.22631.0)
- Microsoft — Windows 11 Version 24H2 (10.0.26100.0)
- Microsoft — Windows 11 Version 25H2 (10.0.26200.0)
- Microsoft — Windows 11 version 26H1 (10.0.28000.0)
- Microsoft — Windows Server 2016 (10.0.14393.0)
- Microsoft — Windows Server 2016 (Server Core installation) (10.0.14393.0)
- Microsoft — Windows Server 2019 (10.0.17763.0)
- Microsoft — Windows Server 2019 (Server Core installation) (10.0.17763.0)
- Microsoft — Windows Server 2022 (10.0.20348.0)
- Microsoft — Windows Server 2025 (10.0.26100.0)
- Microsoft — Windows Server 2025 (Server Core installation) (10.0.26100.0)

## References

- [CNA](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83978)

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-09._