CVE-2026-33411CWE-79

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

Medium · published March 20, 2026

CVSS v3.1
5.4
EPSS
0%
Percentile
20.9
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.4 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00294 · 20.9th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-03-20T22:58Z
EPSS history
Timeline
  • 20 MAR 22:58Z
    Discourse's solved topic stream has potential stored XSS in topic title
    cvelistv5