{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "2.54.0"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "DESCRIPTION"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "d456cd3ce2ec5d2599d6cce9490f01f67332d77f"
            }
          ],
          "repo": "https://github.com/kimai/kimai",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-jrc6-fmhw-fpq2"
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-208"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80199.json"
  },
  "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.",
  "id": "CVE-2026-80199",
  "modified": "2026-08-28T11:30:59.466661861Z",
  "published": "2026-08-25T23:19:05.166Z",
  "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"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Kimai before 2.54.0 Username Enumeration via Timing Oracle"
}