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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.

PUBLISHED Reserved 2026-03-19 | Published 2026-03-19 | Updated 2026-03-20 | Assigner GitHub_M




MEDIUM: 4.4CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N

Problem types

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Product status

>= 2026.1.0-latest, < 2026.1.2
affected

>= 2026.2.0-latest, < 2026.2.1
affected

= 2026.3.0-latest
affected

References

github.com/...course/security/advisories/GHSA-23c7-gq89-xm5v

github.com/...ommit/0471e68ed0b594bf386e068f228849244b880ef1

github.com/...ommit/0c861df8bea03dcc01b60da6cc7038e6c88de4ee

github.com/...ommit/472f9e1f7855307e489e9eaa6825d5335dfc08b5

cve.org (CVE-2026-33395)

nvd.nist.gov (CVE-2026-33395)

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