CVE-2026-23743

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.

PUBLISHED Reserved 2026-01-15 | Published 2026-01-28 | Updated 2026-01-28 | Assigner GitHub_M

Problem types

CWE-200: Exposure of Sensitive Information to an Unauthorized Actor

Product status

References

github.com/...course/security/advisories/GHSA-v5jw-rxc6-4cvv

cve.org (CVE-2026-23743)

nvd.nist.gov (CVE-2026-23743)

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