The MaxGalleria plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's maxgallery_thumb shortcode in all versions up to, and including, 6.4.4 due to insufficient input sanitization and output escaping on user supplied attributes. 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.

The MaxGalleria plugin for WordPress is vulnerable to unauthorized image upload due to a missing capability check on the add_media_library_images_to_gallery function in all versions up to, and including, 6.4.2. This makes it possible for authenticated attackers, with subscriber access or above, to upload arbitrary images to a gallery.

Authenticated (author or higher user role) Stored Cross-Site Scripting (XSS) vulnerability discovered in MaxGalleria WordPress plugin (versions 6.2.5).