{"id":"BIT-discourse-2026-27491","summary":"Discourse has a bypass of official warnings messages by non-staff users","details":"Discourse is an open-source discussion platform. Prior to versions 2026.3.0, 2026.2.1, and 2026.1.2, a type coercion issue in a post actions API endpoint allowed non-staff users to issue warnings to other users. Warnings are a staff-only moderation feature. The vulnerability required the attacker to be a logged-in user and to send a specifically crafted request. No data exposure or privilege escalation beyond the ability to create unauthorized user warnings was possible. Versions 2026.3.0, 2026.2.1, and 2026.1.2 contain a patch. No known workarounds are available.","aliases":["CVE-2026-27491","GHSA-xq37-5fvf-4m4j"],"modified":"2026-09-08T08:45:34.820937710Z","published":"2026-03-27T07:09:52.198Z","database_specific":{"severity":"Medium","cpes":["cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*"]},"references":[{"type":"FIX","url":"https://github.com/discourse/discourse/commit/60a588f4da4ab0feceb2c44787d4261b4f8757be"},{"type":"FIX","url":"https://github.com/discourse/discourse/commit/d3cb203feabc46d765ecb91f348613a2bd531b89"},{"type":"FIX","url":"https://github.com/discourse/discourse/commit/f5fef73827da7520efc517357bd2a6bab35d7886"},{"type":"ADVISORY","url":"https://github.com/discourse/discourse/security/advisories/GHSA-xq37-5fvf-4m4j"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-27491"}],"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":"2026.3.0"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/discourse/BIT-discourse-2026-27491.json"},"severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"}]}],"schema_version":"1.9.0"}