The WP Compress – Image Optimizer [All-In-One] plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the several functions in versions up to, and including, 6.20.01. This makes it possible for authenticated attackers, with subscriber-level permissions and above, to edit plugin settings, including storing cross-site scripting, in multisite environments.

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in AresIT WP Compress wp-compress-image-optimizer allows Reflected XSS.This issue affects WP Compress: from n/a through <= 6.20.13.

The WP Compress – Image Optimizer [All-In-One plugin for WordPress is vulnerable to Open Redirect in all versions up to, and including, 6.20.01. This is due to insufficient validation on the redirect url supplied via the 'css' parameter. This makes it possible for unauthenticated attackers to redirect users to potentially malicious sites if they can successfully trick them into performing an action.

The WP Compress – Image Optimizer plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the 'wpslocalcompress::construct' function in all versions up to, and including, 6.11.10. This makes it possible for unauthenticated attackers to reset the CDN region and set a malicious URL to deliver images.