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CVE-2026-66490 Joomla Extension - balbooa.com - Stored cross-site scripting via a comment avatar in Gridbox < 2.20.2

Medium 6.1 Published Updated

Attackers can inject malicious scripts via comment avatars in the Gridbox extension, potentially compromising user sessions and site integrity.

Exploited in the wild
Not known
Login needed
Not needed
Attackable
Over the internet
Victim action needed
A user has to click or open something
Fix
None listed

What is CVE-2026-66490?

CVE-2026-66490 is a medium-severity cross-site scripting vulnerability in balbooa.com Gridbox extension for Joomla, published on 29 Jul 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

Joomla Extension - balbooa.com - Stored cross-site scripting via a comment avatar in Gridbox < 2.20.2

Weakness: CWE-79

Which versions are affected by CVE-2026-66490?

It affects 1 product.

Products include Balbooa Gridbox.

How do I fix CVE-2026-66490?

No fix has been published for CVE-2026-66490 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-2026-66490 being exploited?

There is no known exploitation of CVE-2026-66490 in the wild and no public exploit code.

Sources

Also known as GHSA-6432-frr4-pgf6.

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