{"schema_version":"2","view":"grouped","data":[{"id":60403,"cve_ids":["CVE-2026-91134"],"payload":{"kind":"advisory","title":"Discourse: Block post iframes whose encoded userinfo bypasses the allowed_iframes allowlist","summary":"Discourse is an open-source discussion platform. Prior to 2026.1.8, 2026.6.3, 2026.7.2, and 2026.8.0, the Discourse post sanitizer allowed a stored cross-origin iframe to bypass the allowed_iframes prefix policy when the iframe src contained encoded userinfo. The sanitizer validated a decoded form differently from the stored iframe src, allowing the browser to interpret an attacker-controlled host while the allowlist check accepted the encoded URL as an allowed prefix. An authenticated user with posting privileges could persist the iframe in a post and cause attacker-controlled cross-origin content to be rendered. This issue is fixed in versions 2026.1.8, 2026.6.3, 2026.7.2, and 2026.8.0.","evidence":"cve:CVE-2026-91134","products":[{"name":{"value":"discourse","evidence":"/containers/cna/affected/0/product"},"prerequisites":[],"fixed_versions":[],"affected_versions":[]}],"severity":"medium","structured":{"id":"CVE-2026-91134","aliases":["CVE-2026-91134"],"metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":5.4,"attackVector":"NETWORK","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","integrityImpact":"LOW","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"NONE","privilegesRequired":"LOW","confidentialityImpact":"LOW"}}],"affected":[{"vendor":"discourse","product":"discourse","versions":[{"status":"affected","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"}]}],"modified":"2026-09-29T02:56:30.376Z","provider":"cve","references":["https://github.com/discourse/discourse/security/advisories/GHSA-54vw-chv3-wjpv","https://github.com/discourse/discourse/pull/42882","https://github.com/discourse/discourse/commit/0a8015e6c7a5079981843721494d30c9a91f5415","https://github.com/discourse/discourse/commit/1304b0c04f87534053b0d574ae5a9b9ba13dd590","https://github.com/discourse/discourse/commit/bac7dd1201911851462483271b4567246fa1309d","https://github.com/discourse/discourse/commit/fed3a58c48412ce7207b72a4629ddbc44482cd64"],"provider_metadata":{"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-91134","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2026-09-29T02:56:20.350456Z"}}}],"providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-09-29T02:56:30.376Z"}}],"cna":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-09-24T16:51:34.057Z"}}},"related_cves":[{"value":"CVE-2026-91134","evidence":"/cveMetadata/cveId"}],"security_relevant":true,"severity_evidence":"/containers/cna/metrics"},"group_id":"advisory:06641605-0f52-4626-88bc-44653c6a0e03","priority":{"reasons":[],"severity":"medium","linked_cves":[{"cve":"CVE-2026-91134","metrics":[],"products":[{"name":{"value":"discourse","evidence":"/affected/0/package/name"},"prerequisites":[],"fixed_versions":[{"value":"2026.8.0","evidence":"/affected/0/ranges"}],"affected_versions":[]}],"severity":"medium","source_id":"core-osv","source_url":"https://osv.dev/vulnerability/BIT-discourse-2026-91134","relationship":"advisory","known_exploited":false,"relationship_evidence":"/cveMetadata/cveId"}],"fix_available":false,"known_exploited":false,"publisher_severity":"medium"},"revision":2,"source_id":"core-cve","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-91134","advisory_id":"06641605-0f52-4626-88bc-44653c6a0e03","event_types":["advisory"],"published_at":"2026-10-25T18:33:26.882235+00:00","technologies":["core-cve","discourse"],"context_update":false,"extraction_method":"structured","source_published_at":"2026-09-24T16:51:34.057+00:00","detail_url":"/advisories/advisory%3A06641605-0f52-4626-88bc-44653c6a0e03","group":{"id":"advisory:06641605-0f52-4626-88bc-44653c6a0e03","revision":1,"primary_event_id":59606,"change":"published","superseded_by":[],"changed":{"id":59606,"cve_ids":["CVE-2026-91134"],"payload":{"kind":"advisory","title":"Discourse: Block post iframes whose encoded userinfo bypasses the allowed_iframes allowlist","summary":"Discourse is an open-source discussion platform. Prior to 2026.1.8, 2026.6.3, 2026.7.2, and 2026.8.0, the Discourse post sanitizer allowed a stored cross-origin iframe to bypass the allowed_iframes prefix policy when the iframe src contained encoded userinfo. The sanitizer validated a decoded form differently from the stored iframe src, allowing the browser to interpret an attacker-controlled host while the allowlist check accepted the encoded URL as an allowed prefix. An authenticated user with posting privileges could persist the iframe in a post and cause attacker-controlled cross-origin content to be rendered. This issue is fixed in versions 2026.1.8, 2026.6.3, 2026.7.2, and 2026.8.0.","evidence":"cve:CVE-2026-91134","products":[{"name":{"value":"discourse","evidence":"/containers/cna/affected/0/product"},"prerequisites":[],"fixed_versions":[],"affected_versions":[]}],"severity":"medium","structured":{"id":"CVE-2026-91134","aliases":["CVE-2026-91134"],"metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":5.4,"attackVector":"NETWORK","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","integrityImpact":"LOW","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"NONE","privilegesRequired":"LOW","confidentialityImpact":"LOW"}}],"affected":[{"vendor":"discourse","product":"discourse","versions":[{"status":"affected","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"}]}],"modified":"2026-09-29T02:56:30.376Z","provider":"cve","references":["https://github.com/discourse/discourse/security/advisories/GHSA-54vw-chv3-wjpv","https://github.com/discourse/discourse/pull/42882","https://github.com/discourse/discourse/commit/0a8015e6c7a5079981843721494d30c9a91f5415","https://github.com/discourse/discourse/commit/1304b0c04f87534053b0d574ae5a9b9ba13dd590","https://github.com/discourse/discourse/commit/bac7dd1201911851462483271b4567246fa1309d","https://github.com/discourse/discourse/commit/fed3a58c48412ce7207b72a4629ddbc44482cd64"],"provider_metadata":{"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-91134","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2026-09-29T02:56:20.350456Z"}}}],"providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-09-29T02:56:30.376Z"}}],"cna":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-09-24T16:51:34.057Z"}}},"related_cves":[{"value":"CVE-2026-91134","evidence":"/cveMetadata/cveId"}],"security_relevant":true,"severity_evidence":"/containers/cna/metrics"},"group_id":"advisory:06641605-0f52-4626-88bc-44653c6a0e03","priority":{"reasons":[],"severity":"medium","linked_cves":[{"cve":"CVE-2026-91134","metrics":[],"products":[{"name":{"value":"discourse","evidence":"/affected/0/package/name"},"prerequisites":[],"fixed_versions":[{"value":"2026.8.0","evidence":"/affected/0/ranges"}],"affected_versions":[]}],"severity":"medium","source_id":"core-osv","source_url":"https://osv.dev/vulnerability/BIT-discourse-2026-91134","relationship":"advisory","known_exploited":false,"relationship_evidence":"/cveMetadata/cveId"}],"fix_available":false,"known_exploited":false,"publisher_severity":"medium"},"revision":2,"source_id":"core-cve","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-91134","advisory_id":"06641605-0f52-4626-88bc-44653c6a0e03","event_types":["advisory"],"published_at":"2026-10-25T18:33:26.882235+00:00","technologies":["core-cve","discourse"],"context_update":true,"extraction_method":"structured","source_published_at":"2026-09-24T16:51:34.057+00:00","detail_url":"/events/59606"},"members":[{"id":59606,"cve_ids":["CVE-2026-91134"],"payload":{"kind":"advisory","title":"Discourse: Block post iframes whose encoded userinfo bypasses the allowed_iframes allowlist","summary":"Discourse is an open-source discussion platform. Prior to 2026.1.8, 2026.6.3, 2026.7.2, and 2026.8.0, the Discourse post sanitizer allowed a stored cross-origin iframe to bypass the allowed_iframes prefix policy when the iframe src contained encoded userinfo. The sanitizer validated a decoded form differently from the stored iframe src, allowing the browser to interpret an attacker-controlled host while the allowlist check accepted the encoded URL as an allowed prefix. An authenticated user with posting privileges could persist the iframe in a post and cause attacker-controlled cross-origin content to be rendered. This issue is fixed in versions 2026.1.8, 2026.6.3, 2026.7.2, and 2026.8.0.","evidence":"cve:CVE-2026-91134","products":[{"name":{"value":"discourse","evidence":"/containers/cna/affected/0/product"},"prerequisites":[],"fixed_versions":[],"affected_versions":[]}],"severity":"medium","structured":{"id":"CVE-2026-91134","aliases":["CVE-2026-91134"],"metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":5.4,"attackVector":"NETWORK","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","integrityImpact":"LOW","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"NONE","privilegesRequired":"LOW","confidentialityImpact":"LOW"}}],"affected":[{"vendor":"discourse","product":"discourse","versions":[{"status":"affected","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"}]}],"modified":"2026-09-29T02:56:30.376Z","provider":"cve","references":["https://github.com/discourse/discourse/security/advisories/GHSA-54vw-chv3-wjpv","https://github.com/discourse/discourse/pull/42882","https://github.com/discourse/discourse/commit/0a8015e6c7a5079981843721494d30c9a91f5415","https://github.com/discourse/discourse/commit/1304b0c04f87534053b0d574ae5a9b9ba13dd590","https://github.com/discourse/discourse/commit/bac7dd1201911851462483271b4567246fa1309d","https://github.com/discourse/discourse/commit/fed3a58c48412ce7207b72a4629ddbc44482cd64"],"provider_metadata":{"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-91134","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2026-09-29T02:56:20.350456Z"}}}],"providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-09-29T02:56:30.376Z"}}],"cna":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-09-24T16:51:34.057Z"}}},"related_cves":[{"value":"CVE-2026-91134","evidence":"/cveMetadata/cveId"}],"security_relevant":true,"severity_evidence":"/containers/cna/metrics"},"group_id":"advisory:06641605-0f52-4626-88bc-44653c6a0e03","priority":{"reasons":[],"severity":"medium","linked_cves":[{"cve":"CVE-2026-91134","metrics":[],"products":[{"name":{"value":"discourse","evidence":"/affected/0/package/name"},"prerequisites":[],"fixed_versions":[{"value":"2026.8.0","evidence":"/affected/0/ranges"}],"affected_versions":[]}],"severity":"medium","source_id":"core-osv","source_url":"https://osv.dev/vulnerability/BIT-discourse-2026-91134","relationship":"advisory","known_exploited":false,"relationship_evidence":"/cveMetadata/cveId"}],"fix_available":false,"known_exploited":false,"publisher_severity":"medium"},"revision":2,"source_id":"core-cve","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-91134","advisory_id":"06641605-0f52-4626-88bc-44653c6a0e03","event_types":["advisory"],"published_at":"2026-10-25T18:33:26.882235+00:00","technologies":["core-cve","discourse"],"context_update":true,"extraction_method":"structured","source_published_at":"2026-09-24T16:51:34.057+00:00","detail_url":"/events/59606"}]}}],"next_after":60403,"next_before":60403}