The Listly: Listicles For WordPress plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the Init() function in all versions up to, and including, 2.7. This makes it possible for unauthenticated attackers to delete arbitrary transient values on the WordPress site.
https://wordpress.org/plugins/listly/
https://plugins.trac.wordpress.org/browser/listly/trunk/listly.php#L151