{"id":"CVE-2026-80199","title":"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","summary":"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…","severity":"low","cvss":3.7,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N","cwe":["CWE-208"],"vendor":"kimai","product":"kimai","affected":["kimai < 2.54.0"],"published":"2026-08-26","updated":"2026-10-08","sourceUpdated":"2026-10-08T16:17:45.830","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-80199","references":[{"url":"https://github.com/kimai/kimai/security/advisories/GHSA-jrc6-fmhw-fpq2","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/kimai-before-2.54.0-username-enumeration-via-timing-oracle","label":"disclosure@vulncheck.com"}],"tags":["nvd","cve.org","exploit-available"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-08-26T12:07:02.895233Z"},"epss":0.00308,"epssPercentile":0.21688,"ingestedAt":"2026-10-08T16:52:14.730Z","slug":"CVE-2026-80199","body":"## Overview\n\nKimai 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":32,"depthScoreParts":{"impact":20.4,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[]}