{"id":"CVE-2021-3740","aliases":["EUVD-2021-27016","GHSA-7c75-4mxr-f248"],"status":"published","title":"Session Fixation in chatwoot/chatwoot","description":"A Session Fixation vulnerability exists in chatwoot/chatwoot versions prior to 2.4.0. The application does not invalidate existing sessions on other devices when a user changes their password, allowing old sessions to persist. This can lead to unauthorized access if an attacker has obtained a session token.","severity":{"version":"3.0","score":6.8,"vector":"CVSS:3.0/AV:A/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00209,"percentile":0.11042,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-384"],"published":"2024-11-15T10:57:09Z","modified":"2026-10-20T10:54:49Z","products":[{"vendor":"chatwoot","product":"chatwoot"},{"vendor":"chatwoot","product":"chatwoot/chatwoot"}],"references":[{"url":"https://huntr.com/bounties/1625470476437-chatwoot/chatwoot","tags":["Broken Link","web"]},{"url":"https://github.com/chatwoot/chatwoot/commit/6fdd4a29969be8423f31890b807d27d13627c50c","tags":["Patch","fix"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-3740"},{"url":"https://github.com/advisories/GHSA-7c75-4mxr-f248"}],"sources":{"cve":[{"id":"CVE-2021-3740","title":"Session Fixation in chatwoot/chatwoot","description":"A Session Fixation vulnerability exists in chatwoot/chatwoot versions prior to 2.4.0. The application does not invalidate existing sessions on other devices when a user changes their password, allowing old sessions to persist. This can lead to unauthorized access if an attacker has obtained a session token.","status":"published","published":"2024-11-15T10:57:09.236Z","modified":"2024-11-15T19:03:09.228Z","cvss":[{"version":"3.0","score":6.8,"vector":"CVSS:3.0/AV:A/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H","level":"medium","assessor":"cna"},{"version":"3.1","score":6.8,"vector":"CVSS:3.1/AV:A/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H","level":"medium","assessor":"adp"}],"cwes":["CWE-384"],"updated_at":"2026-11-02T14:33:04.020035Z"}],"euvd":[{"id":"EUVD-2021-27016","description":"A Session Fixation vulnerability exists in chatwoot/chatwoot versions prior to 2.4.0. The application does not invalidate existing sessions on other devices when a user changes their password, allowing old sessions to persist. This can lead to unauthorized access if an attacker has obtained a session token.","status":"published","published":"2024-11-15T10:57:09Z","modified":"2024-11-15T19:03:09Z","cvss":[{"version":"3.1","score":6.8,"vector":"CVSS:3.1/AV:A/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H","level":"medium"}],"updated_at":"2026-11-03T00:04:58.20762Z"}],"ghsa":[{"id":"GHSA-7c75-4mxr-f248","title":"A Session Fixation vulnerability exists in chatwoot/chatwoot versions prior to 2.4.0. The...","description":"A Session Fixation vulnerability exists in chatwoot/chatwoot versions prior to 2.4.0. The application does not invalidate existing sessions on other devices when a user changes their password, allowing old sessions to persist. This can lead to unauthorized access if an attacker has obtained a session token.","status":"published","published":"2024-11-15T12:31:44Z","modified":"2024-11-15T12:31:45Z","cvss":[{"version":"3.0","score":6.8,"vector":"CVSS:3.0/AV:A/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H","level":"medium"}],"cwes":["CWE-384"],"updated_at":"2026-11-02T14:58:51.371243Z"}],"nvd":[{"id":"CVE-2021-3740","description":"A Session Fixation vulnerability exists in chatwoot/chatwoot versions prior to 2.4.0. The application does not invalidate existing sessions on other devices when a user changes their password, allowing old sessions to persist. This can lead to unauthorized access if an attacker has obtained a session token.","status":"published","published":"2024-11-15T11:15:04.987Z","modified":"2026-06-17T04:05:40.41Z","cvss":[{"version":"3.1","score":6.8,"vector":"CVSS:3.1/AV:A/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H","level":"medium","assessor":"secondary"},{"version":"3.0","score":6.8,"vector":"CVSS:3.0/AV:A/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H","level":"medium","assessor":"secondary"}],"cwes":["CWE-384"],"updated_at":"2026-11-02T14:07:08.629518Z"}],"osv":[{"id":"CVE-2021-3740","description":"A Session Fixation vulnerability exists in chatwoot/chatwoot versions prior to 2.4.0. The application does not invalidate existing sessions on other devices when a user changes their password, allowing old sessions to persist. This can lead to unauthorized access if an attacker has obtained a session token.","status":"published","published":"2024-11-15T11:15:04.987Z","modified":"2026-10-20T10:54:49.122778602Z","cvss":[{"version":"3.1","score":6.8,"vector":"CVSS:3.1/AV:A/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H","level":"medium"}],"updated_at":"2026-11-02T15:44:20.434873Z"}]}}