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CVE-2026-33395

MEDIUM

4.4

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.

CVE Details

CVSS v3.1 Score4.4

SeverityMEDIUM

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

Attack VectorNETWORK

ComplexityHIGH

Privileges RequiredLOW

User InteractionREQUIRED

Published3/19/2026

Last Modified3/24/2026

Sourcenvd

Honeypot Sightings0

Affected Products

discourse:discourse

Weaknesses (CWE)

CWE-79

References

https://github.com/discourse/discourse/commit/0471e68ed0b594bf386e068f228849244b880ef1(security-advisories@github.com)

https://github.com/discourse/discourse/commit/0c861df8bea03dcc01b60da6cc7038e6c88de4ee(security-advisories@github.com)

https://github.com/discourse/discourse/commit/472f9e1f7855307e489e9eaa6825d5335dfc08b5(security-advisories@github.com)

https://github.com/discourse/discourse/security/advisories/GHSA-23c7-gq89-xm5v(security-advisories@github.com)

IOC Correlations

No correlations recorded

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