CVE-2025-58055

Discourse is an open-source community discussion platform. In versions 3.5.0 and below, the Discourse AI suggestion endpoints for topic “Title”, “Category”, and “Tags” allowed authenticated users to extract information about topics that they weren’t authorized to access. By modifying the “topic_id” value in API requests to the AI suggestion endpoints, users could target specific restricted topics. The AI model’s responses then disclosed information that the authenticated user couldn’t normally access. This issue is fixed in version 3.5.1. To workaround this issue, users can restrict group access to the AI helper feature through the "composer_ai_helper_allowed_groups" and "post_ai_helper_allowed_groups" site settings.

CVSS 3.1

4.3CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

EPSS

0.3% chance of exploitation in the next 30 days; higher than 17% of CVEs (scores of 2026-10-25)

CWEs

CWE-639, CWE-284

Published

2025-10-01

Modified

2026-10-19

Record from

the NVD, synced 2026-10-19

Affected

• discourse:discourse

References

• https://github.com/discourse/discourse/commit/28d569cae9b33cd55d647bf41806106e33d975c9
• https://github.com/discourse/discourse/security/advisories/GHSA-32v2-x274-vfhr
• https://www.vicarius.io/vsociety/posts/cve-2025-58055-detect-discourse-vulnerability
• https://www.vicarius.io/vsociety/posts/cve-2025-58055-mitigate-discourse-vulnerability

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