CVE-2026-9134 Cross-site scripting in Photo Gallery by FooGallery : Responsive Image Gallery, Masonry Gallery & Carousel
Authenticated contributors can inject arbitrary scripts via shortcode parameters, leading to stored XSS execution for other users.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-9134?
CVE-2026-9134 is a medium-severity cross-site scripting vulnerability in fooplugins Photo Gallery by FooGallery : Responsive Image Gallery, Masonry Gallery & Carousel, published on 13 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The FooGallery plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'custom_attribute_key' shortcode parameter in versions up to, and including, 3.1.31 This is due to an incomplete JavaScript event handler blacklist in the foogallery_sanitize_javascript() function, which blocks only a subset of HTML event attributes (onmouseover, onmouseout, onpointerenter, onclick, onload, onchange, onerror) while permitting others such as 'onmouseenter', combined with the failure to escape the attribute key when building the gallery container HTML in foogallery_build_container_attributes_safe(). This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Weakness: CWE-79
Which versions are affected by CVE-2026-9134?
How do I fix CVE-2026-9134?
No fix has been published for CVE-2026-9134 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-2026-9134 being exploited?
There is no known exploitation of CVE-2026-9134 in the wild and no public exploit code.
Sources
Also known as GHSA-fq2x-2hqx-f6x7.