{"schema":"threatline.record/2","record":{"id":"CVE-2026-91132","aliases":["GHSA-4q3q-hph3-3rvp"],"summary":"Discourse: Wildcard iframe origin allowlist bypass via authority separators","details":"Discourse is an open-source discussion platform. Prior to 2026.1.8, 2026.6.3, 2026.7.2, and 2026.8.0, sites using wildcard patterns in the allowed_iframes setting could accept a crafted iframe URL whose allowlisted suffix appeared after a URL authority separator. The wildcard origin check matched the allowed domain text, while browser URL parsing selected a different attacker-controlled origin. A user with posting privileges could exploit the flaw through a post or a Onebox oEmbed response and cause an attacker-controlled iframe to be rendered independently of the allowlisted domain. Successful exploitation requires a site-configured wildcard iframe pattern and the ability to create a post or trigger an oEmbed request for an attacker-controlled URL. This issue is fixed in versions 2026.1.8, 2026.6.3, 2026.7.2, and 2026.8.0.","categories":["Applications & CMS"],"product":"discourse","vendor":"discourse","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-91132","source_modified_at":"2026-09-29T02:57:34.925Z","fetched_at":"2026-10-23T18:52:38.922436Z","product":"discourse","vendor":"discourse","versions":[{"version":"< 2026.8.0","status":"affected"},{"version":">= 2026.7.0-latest, < 2026.7.2","status":"affected"},{"version":">= 2026.6.0-latest, < 2026.6.3","status":"affected"},{"version":">= 2026.1.0-latest, < 2026.1.8","status":"affected"}],"defaultStatus":null}],"fixed_versions":[],"cvss":4.3,"severity":"Medium","kev":{"listed":false},"epss":{"probability":0.00136,"percentile":0.0274,"score_date":"2026-10-23"},"published_at":"2026-09-24T16:57:43.082Z","modified_at":"2026-09-29T02:57:34.925Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-91132","fetched_at":"2026-10-23T18:52:38.922436Z","source_modified_at":"2026-09-29T02:57:34.925Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-91132","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/security/advisories/GHSA-4q3q-hph3-3rvp","tags":["x_refsource_CONFIRM"]},{"source":"CVE List","url":"https://github.com/discourse/discourse/pull/42882","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/discourse/discourse/commit/80968704c1acb1d2ea2c6011dbf6c02ff13238e5","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/discourse/discourse/commit/d5ae0940707f95da5bc4562f7b544243e3103f8a","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/discourse/discourse/commit/d88e02ceb2eede4d8b851d9fe8aef753f3aa40b9","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/discourse/discourse/commit/db8064f2a2a2a3feb3308a1c932ac61d950c9e56","tags":["x_refsource_MISC"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"none","automatable":"no","technical_impact":"partial","assessed_at":"2026-09-29T02:57:23.434341Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-09-29T02:57:34.925Z","content_hash":"ba2460db808eafd84591e2f4812f623dc99609e9a79a6729308fc4afec3c961a"}}