CVE-2026-33395

MEDIUM

Discourse has stored click‑based XSS via Graphviz SVG javascript: links

Title source: cna
STIX 2.1

Description

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.

References (4)

Core 4

Scores

CVSS v3 4.4
EPSS 0.0023
EPSS Percentile 13.7%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-79
Status published
Products (5)
discourse/discourse 2026.3.0
discourse/discourse 2026.1.0 - 2026.1.2
discourse/discourse = 2026.3.0-latest
discourse/discourse >= 2026.1.0-latest, < 2026.1.2
discourse/discourse >= 2026.2.0-latest, < 2026.2.1
Published Mar 19, 2026
Tracked Since Mar 20, 2026