Wishlist 2.2.0 revision fix a critical security vulnerability within plugin code
The vulnerability affects all previous versions on the plugin, since 2.0.0, when activated on a server running MySQL <= 5.7
If your environment matches these specifications, we suggest you to update Wishlist plugin to latest version (2.2.0), in order to avoid any possible issue.
Huge thanks to John C. and Sucuri Vulnerabilty Research team for pointing out this problem