The Responsive Clients Logo Gallery Plugin for WordPress plugin through 1.1.9 does not validate and escape some of its shortcode attributes before outputting them back in a page/post where the shortcode is embed, which could allow users with the contributor role and above to perform Stored Cross-Site Scripting attacks.
https://wpscan.com/vulnerability/cdcd3c2c-cb29-4b21-8d3d-7eafbc1d3098