{"id":"CVE-2026-67351","summary":"Serendipity \u003c 2.6.1 Authentication Bypass via Username Collision","details":"Serendipity before 2.6.1 contains an authentication context confusion vulnerability where password validation and session loading operate independently without ensuring both use the same user record. An authenticated Editor can create a username collision with an Administrator account and obtain administrative privileges by logging in with their own password while the session loads the Administrator's account data.","aliases":["GHSA-v645-243f-jwgh"],"modified":"2026-08-02T03:32:11.751096018Z","published":"2026-07-30T13:57:51.756Z","database_specific":{"cna_assigner":"VulnCheck","cwe_ids":["CWE-304"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67351.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67351.json"},{"type":"ADVISORY","url":"https://github.com/s9y/Serendipity/security/advisories/GHSA-v645-243f-jwgh"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-67351"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/serendipity-authentication-bypass-via-username-collision"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/s9y/serendipity","events":[{"introduced":"0"},{"fixed":"9aa100a744977cd3d85e462fe5f190c866d7e8a0"}],"database_specific":{"source":["AFFECTED_FIELD","DESCRIPTION"],"extracted_events":[{"introduced":"0"},{"fixed":"2.6.1"}]}}],"versions":["2.6.0","2.6-beta1","2.5.0","2.5-beta1","2.4.0","2.4-beta1","2.3.0","2.3-rc1","2.3-beta1","2.2.1-alpha1","2.1.1","2.1.0","2.1-rc1","2.1-beta3","2.1-beta2","2.1-beta1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-67351.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"}]}