{"id":"BIT-discourse-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, 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, 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":["CVE-2026-28282","GHSA-6cc8-x3rm-j5pf"],"modified":"2026-09-10T16:01:31.174631694Z","published":"2026-03-27T07:10:17.839Z","database_specific":{"severity":"Medium","cpes":["cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*","cpe:2.3:a:discourse:discourse:*:*:*:*:latest:*:*:*"]},"references":[{"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"},{"type":"ADVISORY","url":"https://github.com/discourse/discourse/security/advisories/GHSA-6cc8-x3rm-j5pf"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-28282"}],"affected":[{"package":{"name":"discourse","ecosystem":"Bitnami","purl":"pkg:bitnami/discourse"},"ranges":[{"type":"SEMVER","events":[{"introduced":"2026.1.0"},{"fixed":"2026.1.2"},{"introduced":"2026.2.0"},{"fixed":"2026.2.1"},{"introduced":"2026.3.0"},{"fixed":"2026.4.0"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/discourse/BIT-discourse-2026-28282.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N"}]}],"schema_version":"1.9.0"}