XSS in Discourse
CVE-2026-33395
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 injec…
Vulnerability class: XSS (Cross-Site Scripting)
EPSS: 0.000 (6.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N.
Affected products
- Discourse — versions >= 2026.1.0-latest, < 2026.1.2, >= 2026.2.0-latest, < 2026.2.1, = 2026.3.0-latest
Weakness classification (CWE)
References
- https://github.com/discourse/discourse/security/advisories/GHSA-23c7-gq89-xm5v (x_refsource_CONFIRM)
- https://github.com/discourse/discourse/commit/0471e68ed0b594bf386e068f228849244b880ef1 (x_refsource_MISC)
- https://github.com/discourse/discourse/commit/0c861df8bea03dcc01b60da6cc7038e6c88de4ee (x_refsource_MISC)
- https://github.com/discourse/discourse/commit/472f9e1f7855307e489e9eaa6825d5335dfc08b5 (x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-33395?
- CVE-2026-33395 is a medium-severity vulnerability in Discourse, classified under Cross-site Scripting. CVSS score: 4.4/10. Published 2026-03-19.
- How severe is CVE-2026-33395?
- Medium severity. CVSS v3 base score is 4.4 out of 10.