CVE-2025-67723
Unknown Unknown - Not Provided
Cross-Site Scripting in Discourse Math Plugin (KaTeX

Publication date: 2026-01-28

Last updated on: 2026-02-09

Assigner: GitHub, Inc.

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.
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Meta Information
Published
2026-01-28
Last Modified
2026-02-09
Generated
2026-06-16
AI Q&A
2026-01-29
EPSS Evaluated
2026-06-15
NVD
CVE-2025-67723
EUVD
EUVD-2025-206450
Affected Vendors & Products
Showing 3 associated CPEs
Vendor Product Version / Range
discourse discourse to 3.5.4 (exc)
discourse discourse From 2025.11.0 (inc) to 2025.11.2 (exc)
discourse discourse 2025.12.0
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
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Executive Summary

This vulnerability is a cross-site scripting (XSS) issue in the Discourse Math plugin when using its KaTeX variant. It is mitigated by the content-security-policy but still present in versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0. The vulnerability allows an attacker to inject malicious scripts via the Math plugin, potentially exploiting the platform.

Impact Analysis

The vulnerability can lead to limited integrity and availability impacts on the Discourse platform. An attacker could execute malicious scripts, which might alter content or disrupt service availability. However, confidentiality is not affected according to the CVSS score.

Mitigation Strategies

To mitigate this vulnerability, you should upgrade the Discourse platform to one of the patched versions: 3.5.4, 2025.11.2, 2025.12.1, or 2026.1.0. Alternatively, you can disable the Discourse Math plugin or configure it to use the Mathjax provider instead of the KaTeX variant.

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