{"schema":"threatline.record/2","record":{"id":"CVE-2017-20290","aliases":[],"summary":"Discourse < 1.9.0.beta13 Reflected XSS via /email/unsubscribed","details":"Discourse 1.9.0.beta2 before 1.9.0.beta13 contains a reflected cross-site scripting vulnerability that allows unauthenticated attackers to inject scripts through the email parameter of /email/unsubscribed. Attackers can craft GET requests with SVG onload payloads, which unsubscribed.html.erb renders unescaped via html_safe, executing JavaScript in victims' browsers. Exploitation evidence was first observed by the Shadowserver Foundation on 2023-10-19.","categories":["Applications & CMS"],"product":"Discourse","vendor":"Discourse","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2017-20290","source_modified_at":"2026-10-22T10:57:24.711Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"Discourse","vendor":"Discourse","versions":[{"version":"1.9.0.beta2","status":"affected","versionType":"custom","lessThan":"1.9.0.beta13"}],"defaultStatus":"unaffected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2017-20290","source_modified_at":"2026-10-22T10:57:24.711Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Discourse","ecosystem":null},"version":"1.9.0.beta13","basis":"first unaffected version stated in the CVE record"}],"cvss":5.1,"severity":"Medium","kev":{"listed":false},"epss":{"probability":0.00265,"percentile":0.17456,"score_date":"2026-10-23"},"published_at":"2026-10-22T10:57:24.711Z","modified_at":"2026-10-22T10:57:24.711Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2017-20290","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-22T10:57:24.711Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2017-20290","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/discourse/discourse/commit/a6f2533d38","tags":["patch"]},{"source":"CVE List","url":"https://github.com/discourse/discourse/commit/6e37f09b19","tags":["technical-description","patch"]},{"source":"CVE List","url":"https://github.com/projectdiscovery/nuclei-templates/blob/main/http/vulnerabilities/other/discourse-xss.yaml","tags":["technical-description"]},{"source":"CVE List","url":"https://www.vulncheck.com/advisories/discourse-1.9.0-beta13-reflected-xss-via-email-unsubscribed","tags":["third-party-advisory"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-22T10:57:24.711Z","content_hash":"2528a20b1ca40ae88bf9a093864eaf892e600ea9c5f992398fe0c42f2b312ba5"}}