CVE-2026-9134
MediumCVSS 6.4Exploitation Probability (EPSS)
Low risk10th percentile - higher than 10% of all known CVEs
Summary
Stored Cross-Site Scripting (XSS) vulnerability in the FooGallery plugin for WordPress up to version 3.1.31. The issue is due to an incomplete JavaScript event handler blacklist in the foogallery_sanitize_javascript() function and failure to escape the attribute key in foogallery_build_container_attributes_safe(). Authenticated attackers with contributor-level access and above can inject arbitrary scripts.
Risk Assessment
Attackers can inject malicious scripts that execute in users' browsers when visiting infected pages, potentially leading to data theft or session hijacking.
Recommendation
Update the FooGallery plugin to the latest version and follow secure coding practices, including proper data sanitization.
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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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

