The Breeze Display plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘cal_size’ parameter in all versions up to, and including, 1.2.3 due to insufficient input sanitization and output escaping. 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.
https://wordpress.org/plugins/wt-display-breeze/#developers
https://plugins.trac.wordpress.org/changeset/3280146/
https://plugins.trac.wordpress.org/browser/wt-display-breeze/trunk/includes/shortcodes.php#L114