Quick answers
- Is CVE-2026-81354 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-81354 being exploited in the wild.
- How severe is CVE-2026-81354?
- High severity, with a CVSS score of 8.2, published 8 September 2026.
- Which products and versions are affected?
- Microsoft Windows Hello unknown.
- Is there a fix for CVE-2026-81354?
- 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-2026-81354 attacked?
- It is attacked with local access.
- Am I affected by CVE-2026-81354?
- Check whether you run Microsoft Windows Hello 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 Windows Hello's memory handling. The vulnerability requires the attacker to already have local access and be able to execute code on the system. By crafting a malicious input or triggering specific Windows Hello operations, an attacker can overflow a heap buffer and overwrite adjacent memory structures. This allows arbitrary code execution at a higher privilege level, enabling local privilege escalation to administrator or SYSTEM level.
Affected products
- Microsoft Windows Hello unknown
Timeline
- 2026-09-08: disclosed