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CVE-2026-23743

🔴 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,...

Published
Jan 28, 2026
Last Modified
Jan 30, 2026
Views
4
Bookmarks
0

Description

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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.

Affected Products (3)

discourse - discourse

Version: *

discourse - discourse

Version: 2025.12.0

discourse - discourse

Version: 2026.1.0

CVSS Scores

CVSS 3.1 7.5
7.5
HIGH
CVSS 2.0 7.5

References

github.com

Additional Information

Source
security-advisories@github.com
State
Analyzed

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