CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Lifecycle Timeline
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Description
Discourse is an open-source discussion platform. From versions 2026.1.0-latest to before 2026.1.3, 2026.2.0-latest to before 2026.2.2, and 2026.3.0-latest to before 2026.3.0, updating a category description via API is not sanitizing the description string, which can lead to XSS attacks. This issue has been patched in versions 2026.1.3, 2026.2.2, and 2026.3.0.
Analysis
Stored cross-site scripting (XSS) in Discourse category description API endpoints allows authenticated users with category management privileges to inject malicious scripts that execute in the browsers of other users viewing the category. The vulnerability affects Discourse versions 2026.1.0 through 2026.1.2, 2026.2.0 through 2026.2.1, and 2026.3.0-pre-release due to missing input sanitization on category description updates. …
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External POC / Exploit Code
Leaving vuln.today
EUVD-2026-17550