{"id":"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.","aliases":["GHSA-jrc6-fmhw-fpq2"],"modified":"2026-08-28T11:30:59.466661861Z","published":"2026-08-25T23:19:05.166Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80199.json","cna_assigner":"VulnCheck","cwe_ids":["CWE-208"]},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/kimai/kimai","events":[{"introduced":"0"},{"fixed":"d456cd3ce2ec5d2599d6cce9490f01f67332d77f"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"2.54.0"}],"source":["AFFECTED_FIELD","DESCRIPTION"]}}],"versions":["2.53.0","2.52.0","2.51.0","2.50.0","2.49.0","2.48.0","2.47.0","2.46.0","2.45.0","2.44.0","2.43.0","2.42.0","2.41.0","2.40.0","2.39.0","2.38.0","2.37.0","2.36.1","2.36.0","2.35.1","2.35.0","2.34.0","2.33.0","2.32.0","2.31.0","2.30.0","2.29.0","2.28.0","2.27.0","2.26.0","2.25.0","2.24.0","2.23.0","2.22.0","2.21.0","2.20.1","2.20.0","2.19.1","2.19.0","2.18.0","2.17.0","2.16.1","2.16.0","2.15.0","2.14.0","2.13.0","2.12.0","2.11.0","2.10.0","2.9.0","2.8.0","2.7.0","2.6.0","2.5.0","2.4.1","2.4.0","2.3.0","2.2.1","2.2.0","2.1.0","2.0.35","2.0.34","2.0.33","2.0.32","2.0.31","2.0.30","2.0.29","2.0.28","2.0.27","2.0.26","2.0.25","2.0.24","2.0.23","2.0.22","2.0.21","2.0.20","2.0.19","2.0.18","2.0.17","2.0.16","2.0.15","2.0.14","2.0.13","2.0.12","2.0.11","2.0.10","2.0.9","2.0.8","2.0.7","2.0.6","2.0.5","2.0.4","2.0.3","2.0.2","2.0.1","2.0.0","2.0.0-rc-1","2.0.0-beta-3","2.0.0-beta-2","1.30.4","2.0.0-beta","2.0.0-alpha","1.30.1","1.30.0","1.29.1","1.29.0","1.28.1","1.28.0","1.27.0","1.26.0","1.25.0","1.24.0","1.23.1","1.23.0","1.22.1","1.22.0","1.21.0","1.20.4","1.20.3","1.20.2","1.20.1","1.20","1.19.7","1.19.6","1.19.5","1.19.4","1.19.3","1.19.2","1.19.1","1.19","1.18.2","1.18.1","1.18","1.17.1","1.17","1.16.10","1.16.9","1.16.8","1.16.7","1.16.6","1.16.5","1.16.4","1.16.3","1.16.2","1.16.1","1.16","1.15.6","1.15.5","1.15.4","1.15.3","1.15.2","1.15.1","1.15","1.14.3","1.14.2","1.14.1","1.14","1.13","1.12","1.11.1","1.11","1.10.2","1.10.1","1.10","1.9","1.8","1.7","1.6.2","1.6.1","1.6","1.5","1.4.2","1.4.1","1.4","1.3","1.2","1.1","1.0.1","1.0","0.9","0.8.1","0.8","0.7","0.6.1","0.6","0.5","0.4","0.3","0.2","0.1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80199.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N"}]}