CVE-2025-67723 MEDIUM

CVE-2025-67723: Discourse vulnerable to stored Cross-site Scripting via Katex in discourse-math plugin

Vendor Discourse
Product discourse
Weakness CWE-79 · XSS
Published January 28, 2026
Last update January 28, 2026
View on NVD All CVEs

CVSS base score

4.6/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction Required
Confidentiality None
Integrity Low

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

January 28, 2026 CVE published
January 28, 2026 Record updated