Medium severity · published Mar 19, 2026
CVE-2026-33395
Discourse has stored click‑based XSS via Graphviz SVG javascript: links
5.4
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 13% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DI
discourse · discourse
>= 2026.1.0-latest, < 2026.1.2; >= 2026.2.0-latest, < 2026.2.1; = 2026.3.0-latest · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-33395
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-33395
Patch
https://github.com/discourse/discourse/commit/0471e68ed0b594bf386e068f228849244b880ef1
Patch
https://github.com/discourse/discourse/commit/0c861df8bea03dcc01b60da6cc7038e6c88de4ee
Patch
https://github.com/discourse/discourse/commit/472f9e1f7855307e489e9eaa6825d5335dfc08b5
Mitigation
https://github.com/discourse/discourse/security/advisories/GHSA-23c7-gq89-xm5v
More from discourse
9.9
CVE-2025-68662
FinalDestination hostname matching allows SSRF protection bypass
9.8
CVE-2025-53102
Discourse is an open-source community discussion platform
9.8
CVE-2025-48877
Discourse is an open-source discussion platform
9.8
CVE-2023-47121
Discourse is an open source platform for community discussion
9.8
CVE-2021-41163
Discourse is an open source platform for community discussion