Quick answers
- Is CVE-2026-78447 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-78447 being exploited in the wild.
- How severe is CVE-2026-78447?
- 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-2026-78447?
- 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-2026-78447 attacked?
- It is attacked with local access.
- Am I affected by CVE-2026-78447?
- 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 due to improper bounds checking when processing biometric input or configuration data. The vulnerability requires local access and an authenticated user context to exploit. A successful attack allows an attacker to overwrite heap memory and execute arbitrary code with elevated privileges, effectively achieving privilege escalation. The specific attack vector and vulnerable code path details would be contained in the full Microsoft Security Update Guide.
Affected products
- Microsoft Windows Biometric Service <UNKNOWN>
Timeline
- 2026-09-08: disclosed