CVE-2025-67723
Medium
Description
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.
SeverityMedium
CVSS4.6
Exploit probability—
Product
Discourse
PublishedJan 28, 2026
First seenJan 28, 2026
Weakness typeCWE-79Cross-site scripting (XSS)
How to fix
Update
- discourse discourse3.5.4, 2025.11.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| discourse discourse | v < 3.5.4, 2025.11.0 ≤ v < 2025.11.2, 2025.12.0 | 3.5.4, 2025.11.2 |
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