Quick answers
- Is CVE-2026-83981 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-83981 being exploited in the wild.
- How severe is CVE-2026-83981?
- High severity, with a CVSS score of 7.8, published 8 September 2026.
- Which products and versions are affected?
- Microsoft Windows Biometric Service <UNKNOWN>.
- Is there a fix for CVE-2026-83981?
- 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-2026-83981 attacked?
- It is attacked with local access.
- Am I affected by CVE-2026-83981?
- Check whether you run Microsoft Windows Biometric Service at an affected version. 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 exists in the Windows Biometric Service (WinBio) that processes biometric input data. The vulnerability can be exploited by an authenticated local attacker to corrupt heap memory and achieve privilege escalation. The attack requires existing local access to the system and does not require network connectivity. Successful exploitation grants an attacker arbitrary code execution at elevated privileges (SYSTEM level), enabling complete system compromise. Microsoft has released security patches to address this vulnerability.
Affected products
- Microsoft Windows Biometric Service <UNKNOWN>
Timeline
- 2026-09-08: disclosed