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

Description (CNA)

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 (CNA)

Vendor / product	Versions
discourse / discourse	affected < 3.5.4; affected >= 2025.11.0-latest, < 2025.11.2; affected >= 2025.12.0-latest, < 2025.12.1; affected >= 2026.1.0-latest, < 2026.1.0

CWE

CWE-79

References

https://github.com/discourse/discourse/security/advisories/GHSA-955h-m28g-5379

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.