{"id":"CVE-2026-59830","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-59830","generatedAt":"2026-10-28T06:35:01.834Z","title":"Viewing the affected user activity streams could execute attacker-controlled script in another user's browser.","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.","published":"2026-09-21T22:16:57.000Z","lastModified":"2026-09-23T17:17:50.000Z","status":"Deferred","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","score":5.4,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N"},"cwe":["CWE-79"],"affected":[],"epss":{"score":0.00289,"percentile":0.213,"date":"2026-10-27","history":[{"date":"2026-09-22","score":0.00165,"percentile":0.06213}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.29%). Track it; it rarely justifies an emergency change on its own."},"changes":[{"kind":"new","label":"New CVE","at":"2026-09-21T22:16:57.000Z","detail":{"score":"5.4","severity":"MEDIUM","publishedAt":"2026-09-21T22:16:57.353Z"},"summary":"New CVE, medium severity (CVSS 5.4)."}],"references":[{"url":"https://github.com/discourse/discourse/commit/dd786594ddd088657a7e6f9fefba5bd889965fe4","source":"security-advisories@github.com"},{"url":"https://github.com/discourse/discourse/releases/tag/v2026.7.0","source":"security-advisories@github.com"},{"url":"https://github.com/discourse/discourse/security/advisories/GHSA-x6mf-p7cg-69rw","source":"security-advisories@github.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-59830","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}