CVE-2026-29048 HumHub: XSS in Button component

Medium 6.9 Published 6 Mar 2026 Updated 9 Mar 2026

Attackers can inject malicious scripts via the Button component, potentially executing code in user browsers and compromising accounts.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-29048?

CVE-2026-29048 is a medium-severity cross-site scripting vulnerability in humhub, published on 6 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

HumHub is an Open Source Enterprise Social Network. In version 1.18.0, a cross-site scripting vulnerability was identified in the Button component of version 1.18.0. Due to inconsistent output encoding at several points within the software, malicious scripts could be injected and executed in the context of the user's browser. This issue has been patched in version 1.18.1.

Weakness: CWE-79

Which versions are affected by CVE-2026-29048?

It affects 1 product.

Products include Humhub Humhub.

How do I fix CVE-2026-29048?

No fix has been published for CVE-2026-29048 yet. Limit exposure of the affected software until one is available.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2026-29048 being exploited?

There is no known exploitation of CVE-2026-29048 in the wild and no public exploit code.

Sources

Also known as GHSA-qxjh-478x-23gm.