{"id":"CVE-2026-59830","state":"PUBLISHED","title":"Discourse: Stored XSS via unescaped actor name in post actions","description":"Discourse is an open-source discussion platform. Prior to 2026.7.0, the post action component failed to escape user-controlled display names before interpolating them into an HTML string passed to trustHTML. A user who could choose a crafted display name could persist markup in post action descriptions. Viewing the affected user activity streams could execute attacker-controlled script in another user's browser. This issue is fixed in version 2026.7.0.","publishedAt":"2026-09-21T21:17:38.733Z","updatedAt":"2026-09-22T15:38:41.155Z","severity":{"score":5.4,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["discourse discourse"],"affected":[{"vendor":"discourse","product":"discourse","versions":[{"version":"< 2026.7.0","status":"affected"}]}],"references":["https://github.com/discourse/discourse/security/advisories/GHSA-x6mf-p7cg-69rw","https://github.com/discourse/discourse/commit/dd786594ddd088657a7e6f9fefba5bd889965fe4","https://github.com/discourse/discourse/releases/tag/v2026.7.0"],"weaknesses":["CWE-79"],"ingestedAt":"2026-10-29T20:12:32.778Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/59xxx/CVE-2026-59830.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-59830","state":"PUBLISHED","datePublished":"2026-09-21T21:17:38.733Z","dateUpdated":"2026-09-22T15:38:41.155Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-07-07T15:00:50.979Z"},"containers":{"cna":{"title":"Discourse: Stored XSS via unescaped actor name in post actions","descriptions":[{"lang":"en","value":"Discourse is an open-source discussion platform. Prior to 2026.7.0, the post action component failed to escape user-controlled display names before interpolating them into an HTML string passed to trustHTML. A user who could choose a crafted display name could persist markup in post action descriptions. Viewing the affected user activity streams could execute attacker-controlled script in another user's browser. This issue is fixed in version 2026.7.0."}],"affected":[{"vendor":"discourse","product":"discourse","versions":[{"version":"< 2026.7.0","status":"affected"}]}],"references":[{"url":"https://github.com/discourse/discourse/security/advisories/GHSA-x6mf-p7cg-69rw","name":"https://github.com/discourse/discourse/security/advisories/GHSA-x6mf-p7cg-69rw","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/discourse/discourse/commit/dd786594ddd088657a7e6f9fefba5bd889965fe4","name":"https://github.com/discourse/discourse/commit/dd786594ddd088657a7e6f9fefba5bd889965fe4","tags":["x_refsource_MISC"]},{"url":"https://github.com/discourse/discourse/releases/tag/v2026.7.0","name":"https://github.com/discourse/discourse/releases/tag/v2026.7.0","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.4,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-79","lang":"en","description":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-09-21T21:17:38.733Z"},"source":{"advisory":"GHSA-x6mf-p7cg-69rw","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-22T14:12:11.883033Z","id":"CVE-2026-59830","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":"2026-09-22T15:38:41.155Z"}}]}}}