Vulnerability Details CVE-2026-33395
Discourse is an open-source discussion platform. Prior to versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2, the discourse-graphviz plugin contains a stored cross-site scripting (XSS) vulnerability that allows authenticated users to inject malicious JavaScript code through DOT graph definitions. For instances with CSP disabled only. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. As a workaround, disable the graphviz plugin, upgrade to a patched version, or enable a content security policy.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 8.5%
CVSS Severity
CVSS v3 Score 4.4
References
- https://github.com/discourse/discourse/commit/0471e68ed0b594bf386e068f228849244b880ef1
- https://github.com/discourse/discourse/commit/0c861df8bea03dcc01b60da6cc7038e6c88de4ee
- https://github.com/discourse/discourse/commit/472f9e1f7855307e489e9eaa6825d5335dfc08b5
- https://github.com/discourse/discourse/security/advisories/GHSA-23c7-gq89-xm5v