In the Simple 301 Redirects by BetterLinks WordPress plugin before 2.0.4, a lack of capability checks and insufficient nonce check on the AJAX action, simple301redirects/admin/activateplugin, made it possible for authenticated users to activate arbitrary plugins installed on vulnerable sites.

In the Simple 301 Redirects by BetterLinks WordPress plugin before 2.0.4, the lack of capability checks and insufficient nonce check on the AJAX actions, simple301redirects/admin/getwildcard and simple301redirects/admin/wildcard, made it possible for authenticated users to retrieve and update the wildcard value for redirects.

A lack of capability checks and insufficient nonce check on the AJAX action in the Simple 301 Redirects by BetterLinks WordPress plugin before 2.0.4, made it possible for authenticated users to install arbitrary plugins on vulnerable sites.

The simple-301-redirects-addon-bulk-uploader plugin through 1.2.4 for WordPress has no requirement for authentication for action=bulk301export or action=bulk301clearlist.

The simple-301-redirects-addon-bulk-uploader plugin before 1.2.5 for WordPress has no protection against 301 redirect rule injection via a CSV file.