{"id":"CVE-2026-27491","state":"PUBLISHED","title":"Discourse has a bypass of official warnings messages by non-staff users","description":"Discourse is an open-source discussion platform. Prior to versions 2026.3.0-latest.1, 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-latest.1, 2026.2.1, and 2026.1.2 contain a patch. No known workarounds are available.","publishedAt":"2026-03-19T20:47:54.668Z","updatedAt":"2026-03-20T20:20:00.790Z","severity":{"score":6.9,"label":"Medium","version":"4.0","vector":"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","source":"GitHub_M"},"assigner":"GitHub_M","products":["discourse discourse"],"affected":[{"vendor":"discourse","product":"discourse","versions":[{"version":">= 2026.1.0-latest, < 2026.1.2","status":"affected"},{"version":">= 2026.2.0-latest, < 2026.2.1","status":"affected"},{"version":"= 2026.3.0-latest","status":"affected"}]}],"references":["https://github.com/discourse/discourse/security/advisories/GHSA-xq37-5fvf-4m4j","https://github.com/discourse/discourse/commit/60a588f4da4ab0feceb2c44787d4261b4f8757be","https://github.com/discourse/discourse/commit/d3cb203feabc46d765ecb91f348613a2bd531b89","https://github.com/discourse/discourse/commit/f5fef73827da7520efc517357bd2a6bab35d7886"],"weaknesses":["CWE-862"],"ingestedAt":"2026-10-29T20:11:31.369Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/27xxx/CVE-2026-27491.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-27491","state":"PUBLISHED","datePublished":"2026-03-19T20:47:54.668Z","dateUpdated":"2026-03-20T20:20:00.790Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-02-19T19:46:03.541Z"},"containers":{"cna":{"title":"Discourse has a bypass of official warnings messages by non-staff users","descriptions":[{"lang":"en","value":"Discourse is an open-source discussion platform. Prior to versions 2026.3.0-latest.1, 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-latest.1, 2026.2.1, and 2026.1.2 contain a patch. No known workarounds are available."}],"affected":[{"vendor":"discourse","product":"discourse","versions":[{"version":">= 2026.1.0-latest, < 2026.1.2","status":"affected"},{"version":">= 2026.2.0-latest, < 2026.2.1","status":"affected"},{"version":"= 2026.3.0-latest","status":"affected"}]}],"references":[{"url":"https://github.com/discourse/discourse/security/advisories/GHSA-xq37-5fvf-4m4j","name":"https://github.com/discourse/discourse/security/advisories/GHSA-xq37-5fvf-4m4j","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/discourse/discourse/commit/60a588f4da4ab0feceb2c44787d4261b4f8757be","name":"https://github.com/discourse/discourse/commit/60a588f4da4ab0feceb2c44787d4261b4f8757be","tags":["x_refsource_MISC"]},{"url":"https://github.com/discourse/discourse/commit/d3cb203feabc46d765ecb91f348613a2bd531b89","name":"https://github.com/discourse/discourse/commit/d3cb203feabc46d765ecb91f348613a2bd531b89","tags":["x_refsource_MISC"]},{"url":"https://github.com/discourse/discourse/commit/f5fef73827da7520efc517357bd2a6bab35d7886","name":"https://github.com/discourse/discourse/commit/f5fef73827da7520efc517357bd2a6bab35d7886","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":6.9,"baseSeverity":"MEDIUM","vectorString":"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","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-862","lang":"en","description":"CWE-862: Missing Authorization","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-03-19T20:47:54.668Z"},"source":{"advisory":"GHSA-xq37-5fvf-4m4j","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-03-20T20:19:52.615042Z","id":"CVE-2026-27491","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-03-20T20:20:00.790Z"}}]}}}