{"id":"CVE-2026-80199","aliases":["GHSA-jrc6-fmhw-fpq2"],"url":"https://o3.security/vulnerability/CVE-2026-80199","summary":"Kimai before 2.54.0 Username Enumeration via Timing Oracle","details":"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.","published":"2026-08-25T23:19:05.166Z","modified":"2026-09-02T03:30:33.375124497Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Packagist","name":"kimai/kimai","fixedVersion":"2.54.0"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80199.json"},{"type":"ADVISORY","url":"https://github.com/kimai/kimai/security/advisories/GHSA-jrc6-fmhw-fpq2"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80199"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/kimai-before-2.54.0-username-enumeration-via-timing-oracle"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-02T03:30:33.375124497Z"}}