The GC Social Wall plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'gc_social_wall' shortcode in all versions up to, and including, 1.15 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 product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.