CVE-2025-67723

MEDIUM

Discourse < 3.5.4 - Cross-Site Scripting in Math Plugin KaTeX Variant

Title source: llm
STIX 2.1

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.

References (1)

Core 1
Core References

Scores

CVSS v3 4.6
EPSS 0.0002
EPSS Percentile 4.6%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:L

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-79
Status published
Products (2)
discourse/discourse 2025.12.0
discourse/discourse < 3.5.4
Published Jan 28, 2026
Tracked Since Feb 18, 2026