CVE-2026-18430

High

Open

TLP:CLEAR

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

NVD CVE.org

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Description

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.

Details

CVSS Score: 7.2
CVSS Vector: 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
Confidence: 90%
Published: Aug 19, 2026
Last Modified: Aug 19, 2026

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