{"id":"PYSEC-2021-319","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":["CVE-2021-40347","GHSA-v83x-78q3-gr2j"],"modified":"2026-06-10T17:01:35.187803742Z","published":"2021-09-10T19:15:00Z","references":[{"type":"WEB","url":"https://gitlab.com/mailman/postorius/-/commit/3d880c56b58bc26b32eac0799407d74b64b7474b"},{"type":"WEB","url":"https://gitlab.com/mailman/postorius/-/tags"},{"type":"WEB","url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=993746"},{"type":"WEB","url":"https://gitlab.com/mailman/postorius/-/issues/531"},{"type":"WEB","url":"https://phabricator.wikimedia.org/T289798"},{"type":"ADVISORY","url":"https://www.debian.org/security/2021/dsa-4970"},{"type":"ADVISORY","url":"https://github.com/advisories/GHSA-v83x-78q3-gr2j"}],"affected":[{"package":{"name":"postorius","ecosystem":"PyPI","purl":"pkg:pypi/postorius"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.3.5"}]}],"versions":["1.0.0","1.0.0a1","1.0.0a2","1.0.0b1","1.0.0b2","1.0.0b3","1.0.1","1.0.2","1.0.3","1.1.0","1.1.1","1.1.2","1.2.0","1.2.0a1","1.2.1","1.2.2","1.2.3","1.2.4","1.3.0","1.3.1","1.3.2","1.3.3","1.3.3rc1","1.3.3rc2","1.3.4","1.3.4rc1"],"database_specific":{"source":"https://github.com/pypa/advisory-database/blob/main/vulns/postorius/PYSEC-2021-319.yaml"}}],"schema_version":"1.7.5"}