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 werent 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 models responses then disclosed information that the authenticated user couldnt 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.