The Popup Builder plugin 2.2.8 through 2.6.7.6 for WordPress is vulnerable to SQL injection (in the sgImportPopups function in sgpopupajax.php) via PHP Deserialization on attacker-controlled data with the attachmentUrl POST variable. This allows creation of an arbitrary WordPress Administrator account, leading to possible Remote Code Execution because Administrators can run PHP code on Wordpress instances. (This issue has been fixed in the 3.x branch of popup-builder.)

The Popup Builder – Create highly converting, mobile friendly marketing popups. plugin for WordPress is vulnerable to unauthorized access of functionality due to a missing capability check on several functions in all versions up to, and including, 4.3.1. While some functions contain a nonce check, the nonce can be obtained from the profile page of a logged-in user. This allows subscribers to perform several actions including deleting subscribers and perform blind Server-Side Request Forgery.

The Popup Builder plugin for WordPress is vulnerable to Sensitive Information Exposure in all versions up to, and including, 4.3.6 via the Subscribers Import feature. This makes it possible for unauthenticated attackers to extract sensitive data after an administrator has imported subscribers via a CSV file. This data may include the first name, last name, e-mail address, and potentially other personally identifiable information of subscribers.

The Popup Builder plugin for WordPress is vulnerable to unauthorized modification of data and loss of data due to a missing capability check on all AJAX actions. This makes it possible for authenticated attackers, with subscriber-level access and above, to perform multiple unauthorized actions, such as deleting subscribers, and importing subscribers to conduct stored cross-site scripting attacks.

The "All Subscribers" setting page of Popup Builder was vulnerable to reflected Cross-Site Scripting.

Cross-Site Request Forgery (CSRF) vulnerability in Sygnoos Popup Builder plugin <= 4.1.11 at WordPress allows an attacker to update plugin settings.

Cross-Site Request Forgery (CSRF) vulnerability in Sygnoos Popup Builder plugin <= 4.1.0 at WordPress leading to popup status change.