CVE-2026-91132
- Source
- https://cve.org/CVERecord?id=CVE-2026-91132
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-91132.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-91132
- Aliases
-
- BIT-discourse-2026-91132
- GHSA-4q3q-hph3-3rvp
- Published
- 2026-09-24T16:57:43Z
- Modified
- 2026-10-28T02:30:34Z
- Severity
-
- 4.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N CVSS Calculator
- 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.
- Database specific
{ "cna_assigner": "GitHub_M", "cwe_ids": [ "CWE-346" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/91xxx/CVE-2026-91132.json" }- References
-
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/91xxx/CVE-2026-91132.json
- https://github.com/discourse/discourse/security/advisories/GHSA-4q3q-hph3-3rvp
- https://nvd.nist.gov/vuln/detail/CVE-2026-91132
- https://github.com/discourse/discourse/commit/80968704c1acb1d2ea2c6011dbf6c02ff13238e5
- https://github.com/discourse/discourse/commit/d5ae0940707f95da5bc4562f7b544243e3103f8a
- https://github.com/discourse/discourse/commit/d88e02ceb2eede4d8b851d9fe8aef753f3aa40b9
- https://github.com/discourse/discourse/commit/db8064f2a2a2a3feb3308a1c932ac61d950c9e56
- https://github.com/discourse/discourse/pull/42882
Affected packages
Git / github.com/discourse/discourse
Affected ranges
- Type
- GIT
- Repo
- https://github.com/discourse/discourse
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedFixedIntroducedFixedIntroducedFixedIntroducedFixedFixedFixedFixedFixed
- Database specific
-
Show details
{ "extracted_events": [ { "range": [ { "introduced": "0" }, { "fixed": "2026.8.0" } ], "source": "AFFECTED_FIELD", "strategy": "StringRangeExpression" }, { "range": [ { "introduced": "2026.7.0-latest" }, { "fixed": "2026.7.2" } ], "source": "AFFECTED_FIELD", "strategy": "StringRangeExpression" }, { "range": [ { "introduced": "2026.6.0-latest" }, { "fixed": "2026.6.3" } ], "source": "AFFECTED_FIELD", "strategy": "StringRangeExpression" }, { "range": [ { "introduced": "2026.1.0-latest" }, { "fixed": "2026.1.8" } ], "source": "AFFECTED_FIELD", "strategy": "StringRangeExpression" }, { "range": [ { "fixed": "80968704c1acb1d2ea2c6011dbf6c02ff13238e5" } ], "source": "REFERENCES_COMMIT" }, { "range": [ { "fixed": "d5ae0940707f95da5bc4562f7b544243e3103f8a" } ], "source": "REFERENCES_COMMIT" }, { "range": [ { "fixed": "d88e02ceb2eede4d8b851d9fe8aef753f3aa40b9" } ], "source": "REFERENCES_COMMIT" }, { "range": [ { "fixed": "db8064f2a2a2a3feb3308a1c932ac61d950c9e56" } ], "source": "REFERENCES_COMMIT" } ] }