Martin-Brennan

Name of the Vulnerable Software and Affected Versions Discourse versions 2026.1.0 through 2026.1.2, 2026.2.0 through 2026.2.1, and 2026.3.0 through 2026.3.0 Description Discourse, an open-source discussion platform, is affected by a cross-site scripting (XSS) issue. Updating a category description through the API does not properly sanitize the input string, potentially allowing for the injection of malicious scripts. The API endpoint used for updating category descriptions is vulnerable. The `description` parameter is not sanitized, enabling XSS attacks. Recommendations Update to Discourse version 2026.1.3 or later. Update to Discourse version 2026.2.2 or later. Update to Discourse version 2026.3.0 or later.