{"id":"CVE-2021-40347","details":"An issue was discovered in views/list.py in GNU Mailman Postorius before 1.3.5. An attacker (logged into any account) can send a crafted POST request to unsubscribe any user from a mailing list, also revealing whether that address was subscribed in the first place.","aliases":["GHSA-v83x-78q3-gr2j","PYSEC-2021-319"],"modified":"2026-07-08T23:58:03.568247Z","published":"2021-09-10T19:15:08.163Z","related":["openSUSE-SU-2024:12306-1"],"references":[{"type":"ADVISORY","url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=993746"},{"type":"ADVISORY","url":"https://gitlab.com/mailman/postorius/-/tags"},{"type":"ADVISORY","url":"https://www.debian.org/security/2021/dsa-4970"},{"type":"FIX","url":"https://gitlab.com/mailman/postorius/-/commit/3d880c56b58bc26b32eac0799407d74b64b7474b"},{"type":"FIX","url":"https://gitlab.com/mailman/postorius/-/issues/531"},{"type":"FIX","url":"https://phabricator.wikimedia.org/T289798"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://gitlab.com/mailman/postorius","events":[{"introduced":"0"},{"fixed":"e2d06746acad481e889de200dc1de503cab35874"},{"fixed":"3d880c56b58bc26b32eac0799407d74b64b7474b"}],"database_specific":{"cpe":"cpe:2.3:a:postorius_project:postorius:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"0"},{"fixed":"1.3.5"}],"source":["CPE_RANGE","REFERENCES"]}}],"versions":["1.3.4","1.3.4rc1","1.3.3","1.3.3rc2","1.3.3rc1","1.3.2","1.3.1","1.3.0","1.2.4","1.2.3","1.2.2","1.2.1","1.2.0","1.1.2","1.1.0","1.0.2","1.0.1","1.0.0","1.0.0b2","1.0.0b1","postorius-1.0.0a-pypi","postorius-1.0.0a1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-40347.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N"}]}