CVE-2026-33411

MEDIUM

Discourse's solved topic stream has potential stored XSS in topic title

Title source: cna

Description

Discourse is an open-source discussion platform. Versions prior to 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 have a potential stored XSS in topic titles for the solved posts stream. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. As a workaround, ensure that the Content Security Policy is enabled, and has not been modified in a way which would make it more vulnerable to XSS attacks.

References (1)

[X_Refsource_Confirm] https://github.com/discourse/discourse/security/advisories/GHSA-j3mm-ghh2-83x2

Scores

CVSS v3 5.4

EPSS 0.0001

EPSS Percentile 2.4%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Details

CWE

CWE-79

Status published

Products (5)

discourse/discourse 2026.3.0

discourse/discourse 2026.1.0 - 2026.1.2

discourse/discourse >= 2026.1.0-latest, < 2026.1.2

discourse/discourse >= 2026.2.0-latest, < 2026.2.1

discourse/discourse = 2026.3.0-latest

Published Mar 20, 2026

Tracked Since Mar 21, 2026