CVE-2025-67723: Discourse vulnerable to stored Cross-site Scripting via Katex in discourse-math plugin
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.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2025-67723?
CVE-2025-67723 is considered a high-severity vulnerability due to its potential for stored cross-site scripting attacks.
How do I fix CVE-2025-67723?
To remediate CVE-2025-67723, upgrade Discourse to version 3.5.4 or later, or to versions 2025.11.2, 2025.12.1, or 2026.1.0.
Which versions of Discourse are affected by CVE-2025-67723?
CVE-2025-67723 affects Discourse versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0.
What type of vulnerability is CVE-2025-67723?
CVE-2025-67723 is a stored Cross-site Scripting (XSS) vulnerability in the Discourse Math plugin.
How can attackers exploit CVE-2025-67723?
Attackers can exploit CVE-2025-67723 by injecting malicious scripts into user-generated content that is processed by the Discourse Math plugin.