CVE-2026-80199

Description

Kimai before 2.54.0 contains a timing oracle vulnerability in TokenAuthenticator that allows unauthenticated attackers to enumerate valid usernames via X-AUTH-USER header. Attackers can measure response time differences when the password hasher runs only for existing users, enabling username enumeration with no login throttling protection.

CVSS Vector

References

• https://github.com/kimai/kimai/security/advisories/GHSA-jrc6-fmhw-fpq2
• https://www.vulncheck.com/advisories/kimai-before-2.54.0-username-enumeration-via-timing-oracle