Input validation vulnerability in Responsive Column Widgets 1.2.7

The Responsive Column Widgets plugin for WordPress is vulnerable to a type of attack called Open Redirect. This type of attack can be used by unauthenticated attackers to redirect users to malicious sites. The vulnerability affects versions up to and including 1.2.7 of the plugin. This is due to insufficient validation of the redirect url supplied via the responsive_column_widgets_link parameter. By successfully tricking users into performing an action, unauthenticated attackers can use this vulnerability to take them to malicious sites.