Vulnerability Description
Discourse is an open source discussion platform. In versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, permalinks pointing to access-restricted resources (private topics, categories, posts, or hidden tags) were redirecting users to URLs containing the resource slug, even when the user didn't have access to view the resource. This leaked potentially sensitive information (e.g., private topic titles) via the redirect Location header and the 404 page's search box. This issue is patched in versions 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0. No known workarounds are available.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Discourse | Discourse | < 3.5.4 |
Related Weaknesses (CWE)
References
- https://github.com/discourse/discourse/security/advisories/GHSA-v5jw-rxc6-4cvvThird Party Advisory
FAQ
What is CVE-2026-23743?
CVE-2026-23743 is a vulnerability with a CVSS score of 7.5 (HIGH). Discourse is an open source discussion platform. In versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, permalinks pointing to access-restricted resources (private topics, categories, posts, ...
How severe is CVE-2026-23743?
CVE-2026-23743 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-23743?
Check the references section above for vendor advisories and patch information. Affected products include: Discourse Discourse.