CVE-2025-67723CWE-79

Discourse vulnerable to stored Cross-site Scripting via Katex in discourse-math plugin

Medium · published January 28, 2026

CVSS v3.1
4.6
EPSS
0%
Percentile
11.9
In the wild
Unconfirmed
What it is

Discourse is an open source discussion platform. Versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0 have a content-security-policy-mitigated cross-site scriptinv vulnerability on the Discourse Math plugin when using its KaTeX variant. This issue is patched in versions 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0. As a workaround, the Discourse Math plugin can be disabled, or the Mathjax provider can be used instead of KaTeX.

The record
Technical detail
CVSS v3.1
4.6 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:L
CVSS v4.0
Not supplied
EPSS
0.00220 · 11.9th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-01-28T18:21Z
EPSS history
Timeline
  • 28 JAN 18:21Z
    Discourse vulnerable to stored Cross-site Scripting via Katex in discourse-math plugin
    cvelistv5