CVE-2026-18526highCWE-79

CVE-2026-18526: high-severity vulnerability in HumHub

HumHub 1.18.4 / 1.18.4-pl1 – Stored Cross-Site Scripting in oEmbed confirmation

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21Vexday Risk Score

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

ssvc Trackcvss 7.4epss 0.5%
HumHub Community Edition 1.18.4 and 1.18.4-pl1 contain a stored Cross-Site Scripting (XSS) vulnerability in the oEmbed confirmation rendering workflow.
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/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-2026-18430HIGHHumHub 1.18.4 - Stored XSS in comment-deletion notifications through unescaped administrator reasonEPSS 0.5%