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CVE-2026-23743
Good to know:
Date: January 28, 2026
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.
Severity Score
Severity Score
Weakness Type (CWE)
Exposure of Sensitive Information to an Unauthorized Actor
CWE-200Top Fix
Upgrade Version
Upgrade to version https://github.com/discourse/discourse.git - v3.5.4;https://github.com/discourse/discourse.git - v2025.11.2;https://github.com/discourse/discourse.git - v2025.12.1;https://github.com/discourse/discourse.git - v2026.1.0
CVSS v3.1
| Base Score: |
|
|---|---|
| Attack Vector (AV): | NETWORK |
| Attack Complexity (AC): | LOW |
| Privileges Required (PR): | NONE |
| User Interaction (UI): | NONE |
| Scope (S): | UNCHANGED |
| Confidentiality (C): | LOW |
| Integrity (I): | NONE |
| Availability (A): | NONE |