CVE-2026-91123
- Source
- https://cve.org/CVERecord?id=CVE-2026-91123
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-91123.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-91123
- Aliases
-
- BIT-discourse-2026-91123
- GHSA-6pwj-wgg8-4rjc
- Published
- 2026-09-24T16:54:59Z
- Modified
- 2026-10-28T02:30:32Z
- Severity
-
- 7.2 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N CVSS Calculator
- Summary
- Discourse: Reject literal backslash path separators in iframe src traversal guard
- Details
-
Discourse is an open-source discussion platform. Prior to 2026.1.8, 2026.6.3, 2026.7.2, and 2026.8.0, the iframe src traversal guard did not treat literal backslashes as path separators after decoded dot segments. A crafted source could therefore pass an allowed_iframes subpath check while browser URL normalization moved the iframe outside the intended allowed path. The resulting iframe could load content from a location that the administrator did not allow. 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-22" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/91xxx/CVE-2026-91123.json" }- References
-
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/91xxx/CVE-2026-91123.json
- https://github.com/discourse/discourse/security/advisories/GHSA-6pwj-wgg8-4rjc
- https://nvd.nist.gov/vuln/detail/CVE-2026-91123
- https://github.com/discourse/discourse/commit/042d7b159beda4f74d23e245e8b2e396d9ff8318
- https://github.com/discourse/discourse/commit/097ce5600a2d74d9c68e57974597ab2684bd2a24
- https://github.com/discourse/discourse/commit/0b5a27e689925edce9ba9b14110022435d2b94be
- https://github.com/discourse/discourse/commit/142f5155ad8e56ddb8012c4e70c69a03dedc0579
- 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": "042d7b159beda4f74d23e245e8b2e396d9ff8318" } ], "source": "REFERENCES_COMMIT" }, { "range": [ { "fixed": "097ce5600a2d74d9c68e57974597ab2684bd2a24" } ], "source": "REFERENCES_COMMIT" }, { "range": [ { "fixed": "0b5a27e689925edce9ba9b14110022435d2b94be" } ], "source": "REFERENCES_COMMIT" }, { "range": [ { "fixed": "142f5155ad8e56ddb8012c4e70c69a03dedc0579" } ], "source": "REFERENCES_COMMIT" } ] }