CVE-2026-9134
MediumCVSS 6.4Exploitation Probability (EPSS)
Low risk11th percentile — higher than 11% of all known CVEs
Summary
The FooGallery plugin for WordPress is vulnerable to Stored Cross-Site Scripting (XSS) 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.
Risk Assessment
Authenticated attackers with contributor-level access and above can inject arbitrary web scripts, potentially leading to session hijacking and data theft.
Recommendation
It is recommended to update the FooGallery plugin to the latest version to mitigate this vulnerability and review access for users with contributor-level permissions.
Original NVD description (English source)
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.