CVE-2026-33395
Discourse has stored click‑based XSS via Graphviz SVG javascript: links
5.4
MEDIUM
CVSS 3.1
EPSS 0.02%
Description
Discourse is an open-source discussion platform. Prior to versions 2026.3.0, 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, 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.
How to fix CVE-2026-33395
To remediate CVE-2026-33395, upgrade the affected package to a fixed version below.
- —upgrade to 2026.1.2 or later
Is CVE-2026-33395 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- >= 2026.1.0, < 2026.1.2, >= 2026.2.0, < 2026.2.1, >= 2026.3.0, < 2026.3.0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N |
References (5)
- WEBgithub.com/discourse/discourse/commit/0471e68ed0b594bf386e068f228849244b880ef1
- WEBgithub.com/discourse/discourse/commit/0c861df8bea03dcc01b60da6cc7038e6c88de4ee
- WEBgithub.com/discourse/discourse/commit/472f9e1f7855307e489e9eaa6825d5335dfc08b5
- WEBgithub.com/discourse/discourse/security/advisories/GHSA-23c7-gq89-xm5v