CVE-2026-18526

High

Description

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.

SeverityHigh

CVSS7.4

Exploit probability—

Product

HumHub

PublishedAug 19, 2026

First seenAug 19, 2026

Weakness typeCWE-79Cross-site scripting (XSS)

How to fix

Patches

github.com/humhub/humhub/pull/8373

Affected products

Product	Affected versions	Fixed in
HumHub HumHub	1.18.4	—

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