The Freemius SDK, as used by hundreds of WordPress plugin and theme developers, was vulnerable to Cross-Site Request Forgery and Information disclosure due to missing capability checks and nonce protection on the _get_debug_log, _get_db_option, and the _set_db_option functions in versions up to, and including 2.4.2. Any WordPress plugin or theme running a version of Freemius less than 2.4.3 is vulnerable.

Exposure of Sensitive Information to an Unauthorized Actor vulnerability in David Maucher Send Users Email allows Accessing Functionality Not Properly Constrained by ACLs.This issue affects Send Users Email: from n/a through 1.5.1.

Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Suman Bhattarai Send Users Email.This issue affects Send Users Email: from n/a through 1.4.3.

Unauth. Reflected Cross-Site Scripting (XSS) vulnerability in I Thirteen Web Solution Mass Email To users plugin <= 1.1.4 versions.

The Bulk Delete Users by Email WordPress plugin through 1.2 does not sanitise and escape a parameter before outputting it back in the page, leading to a Reflected Cross-Site Scripting

The Bulk Delete Users by Email WordPress plugin through 1.2 does not have CSRF check when deleting users, which could allow attackers to make a logged in admin delete non admin users by knowing their email via a CSRF attack

The Email Users WordPress plugin through 4.8.8 does not have CSRF check in place when updating its settings, which could allow attackers to make a logged in admin change them via a CSRF attack and change the notification settings of arbitrary users

The WP Email Users WordPress plugin through 1.7.6 does not escape the data_raw parameter in the weu_selected_users_1 AJAX action, available to any authenticated users, allowing them to perform SQL injection attacks.