CVE-2026-18430highCWE-79

CVE-2026-18430: high-severity vulnerability in HumHub

HumHub 1.18.4 - Stored XSS in comment-deletion notifications through unescaped administrator reason

Published

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21Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 7.2epss 0.5%
HumHub 1.18.4 contains a stored cross-site scripting vulnerability in the comment-deletion notification flow. A Space administrator can delete another user's comment, choose to notify the original author, and place HTML/JavaScript in the deletion reason.
CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:H/VI:H/VA:N/SC:L/SI:L/SA:N
Affected products
HumHub · HumHub
Related CVEs — HumHub

In the same product, most dangerous first.

CVE-2026-18756HIGHHumHub Community Edition 1.18.4-pl1 - Reflected XSS in Space membership request button renderingEPSS 0.5%CVE-2026-18526HIGHHumHub 1.18.4 / 1.18.4-pl1 – Stored Cross-Site Scripting in oEmbed confirmationEPSS 0.5%