Quick answers
- Is CVE-2026-83849 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-83849 being exploited in the wild.
- How severe is CVE-2026-83849?
- Medium severity, with a CVSS score of 5.5, published 13 October 2026.
- Which products and versions are affected?
- Microsoft Windows Hello.
- Is there a fix for CVE-2026-83849?
- 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-2026-83849 attacked?
- It is attacked with local access, in an operating system.
- Am I affected by CVE-2026-83849?
- Check whether you run Microsoft Windows Hello. 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
An out-of-bounds read vulnerability exists in Windows Hello that allows an authenticated local attacker to read memory beyond intended boundaries. The vulnerability requires prior authorization (an existing user account on the system) and local access to exploit. Successful exploitation could result in disclosure of sensitive information stored in Windows Hello's memory regions, such as biometric templates or authentication tokens.
Affected products
- Microsoft Windows Hello
Timeline
- 2026-10-13: disclosed