CVE-2026-91132

{"id": "CVE-2026-91132", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-91132", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-09-29T02:57:23.434341Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 4.3, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 1.4, "exploitabilityScore": 2.8}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"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"}]}]}], "published": "2026-09-24T17:17:08.723", "references": [{"url": "https://github.com/discourse/discourse/commit/80968704c1acb1d2ea2c6011dbf6c02ff13238e5", "source": "security-advisories@github.com"}, {"url": "https://github.com/discourse/discourse/commit/d5ae0940707f95da5bc4562f7b544243e3103f8a", "source": "security-advisories@github.com"}, {"url": "https://github.com/discourse/discourse/commit/d88e02ceb2eede4d8b851d9fe8aef753f3aa40b9", "source": "security-advisories@github.com"}, {"url": "https://github.com/discourse/discourse/commit/db8064f2a2a2a3feb3308a1c932ac61d950c9e56", "source": "security-advisories@github.com"}, {"url": "https://github.com/discourse/discourse/pull/42882", "source": "security-advisories@github.com"}, {"url": "https://github.com/discourse/discourse/security/advisories/GHSA-4q3q-hph3-3rvp", "source": "security-advisories@github.com"}], "vulnStatus": "Deferred", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-346"}]}], "descriptions": [{"lang": "en", "value": "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."}], "lastModified": "2026-09-29T03:17:21.457", "sourceIdentifier": "security-advisories@github.com"}