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.

• CWE-79

• https://github.com/discourse/discourse/commit/0471e68ed0b594bf386e068f228849244b880ef1Patch
• https://github.com/discourse/discourse/commit/0c861df8bea03dcc01b60da6cc7038e6c88de4eePatch
• https://github.com/discourse/discourse/commit/472f9e1f7855307e489e9eaa6825d5335dfc08b5Patch
• https://github.com/discourse/discourse/security/advisories/GHSA-23c7-gq89-xm5vMitigation, Vendor Advisory

Published

Mar 19, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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