# CVE-2026-83988: Microsoft Windows Biometric Service heap buffer overflow

Source: https://junglewise.ai/threats/cve-2026-83988-microsoft-windows-biometric-service-heap-buffer-overflow  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-08. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-83988 · Severity: high · CVSS 7.8 · Published 2026-09-08

Windows Biometric Service is a system component that manages fingerprint and other biometric authentication on Windows computers. A heap buffer overflow in this service allows an authorized user to execute code with elevated privileges, potentially taking complete control of the system. This could enable attackers to bypass security controls, steal sensitive data, or install persistent malware.

Technologies: [Microsoft Windows Biometric Service](https://junglewise.ai/threats/technologies/windows-biometric-service). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-83988 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-83988 being exploited in the wild.

**How severe is CVE-2026-83988?** High severity, with a CVSS score of 7.8, published 8 September 2026.

**Which products and versions are affected?** Microsoft Windows Biometric Service.

**Is there a fix for CVE-2026-83988?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-83988 attacked?** It is attacked with local access.

**Am I affected by CVE-2026-83988?** Check whether you run Microsoft Windows Biometric Service. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A heap-based buffer overflow vulnerability exists in the Windows Biometric Service, a core Windows component handling biometric authentication. The vulnerability requires the attacker to already have local access and authorization to use the biometric service. By sending specially crafted input to the service, an attacker can overflow a heap buffer and overwrite memory, leading to privilege escalation from a standard user context to SYSTEM or another elevated privilege level. Exploitation requires local attack vector and prior authentication, but does not require user interaction. Microsoft has released patches to address this vulnerability.

## Affected products

- Microsoft Windows Biometric Service

## Timeline

- 2026-09-08: disclosed
- 2026-09-08: advisory

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83988](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83988)

## Related threats

- [Microsoft Windows Biometric Service heap buffer overflow privilege escalation](https://junglewise.ai/threats/cve-2026-83987-microsoft-windows-biometric-service-heap-buffer-overflow)
- [Microsoft Windows Biometric Service heap buffer overflow](https://junglewise.ai/threats/cve-2026-83985-microsoft-windows-biometric-service-heap-buffer-overflow)
- [Microsoft Windows Biometric Service heap buffer overflow](https://junglewise.ai/threats/cve-2026-83981-microsoft-windows-biometric-service-heap-buffer-overflow)
- [Microsoft Windows Biometric Service heap-based buffer overflow](https://junglewise.ai/threats/cve-2026-83980-microsoft-windows-biometric-service-heap-based-buffer-overflow)
- [Microsoft Windows Biometric Service heap overflow privilege escalation](https://junglewise.ai/threats/cve-2026-83978-microsoft-windows-biometric-service-heap-overflow-privilege)