{"id":"CVE-2026-28282","summary":"Discourse vulnerable to group membership addition permission bypass via discourse-policy plugin","details":"Discourse is an open-source discussion platform. Versions prior to 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 have a security flaw in the discourse-policy plugin which allowed a user with policy creation permission to gain membership access to any private/restricted groups. Once membership to a private/restricted group has been obtained, the user will be able to read private topics that only the group has access to. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. As a workaround, review all policies for the use of `add-users-to-group` and temporarily remove the attribute from the policy. Alternatively, disable the discourse-policy plugin by disabling the `policy_enabled` site setting.","aliases":["BIT-discourse-2026-28282","GHSA-6cc8-x3rm-j5pf"],"modified":"2026-08-12T03:51:31.396521215Z","published":"2026-03-19T21:45:13.648Z","database_specific":{"cwe_ids":["CWE-863"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/28xxx/CVE-2026-28282.json","cna_assigner":"GitHub_M"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/28xxx/CVE-2026-28282.json"},{"type":"ADVISORY","url":"https://github.com/discourse/discourse/security/advisories/GHSA-6cc8-x3rm-j5pf"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-28282"},{"type":"FIX","url":"https://github.com/discourse/discourse/commit/64e2514ac17046cfaa8bc68a3c5140bc40736add"},{"type":"FIX","url":"https://github.com/discourse/discourse/commit/c14b8a4cc5fc94e4839a83c5d55765897589f45b"},{"type":"FIX","url":"https://github.com/discourse/discourse/commit/dcde9de530f515e88f99957056ffbcc2e1e03951"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/discourse/discourse","events":[{"introduced":"322d3c0ac6a8f133b3f82875e9dbbe310f638c1b"},{"fixed":"808b2ac23d8ff421563b40203091026732471c60"},{"introduced":"f7cec86997edc21d6074ceb7666f7e2e6e1b1fdf"},{"fixed":"f38464e46df1b8c51f7d60826502476908d6bb2b"},{"introduced":"896e810e1b296478bba91559a8fc89a9926f11fe"},{"fixed":"64e2514ac17046cfaa8bc68a3c5140bc40736add"},{"fixed":"c14b8a4cc5fc94e4839a83c5d55765897589f45b"},{"fixed":"dcde9de530f515e88f99957056ffbcc2e1e03951"}],"database_specific":{"source":["CPE_RANGE","CPE_STRING","REFERENCES"],"cpe":["cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*","cpe:2.3:a:discourse:discourse:2026.3.0:*:*:*:latest:*:*:*"],"extracted_events":[{"introduced":"2026.1.0"},{"fixed":"2026.1.2"},{"introduced":"2026.2.0"},{"fixed":"2026.2.1"},{"introduced":"2026.3.0"},{"last_affected":"2026.3.0"}]}}],"versions":["2026.3.0","= 2026.3.0-latest","v2026.1.1","v2026.2.0","v2026.3.0-latest","v2026.1.0","stable","esr","v2026.2.0-latest","v2026.1.0-latest"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-28282.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N"}]}