What the vulnerability does
01Description
The WP Compress – Instant Performance & Speed Optimization plugin for WordPress is vulnerable to unauthorized access, modification, and loss of data due to missing capability checks on its on its AJAX functions in all versions up to, and including, 6.30.15. This makes it possible for authenticated attackers, with Subscriber-level access and above, to compromise the site in various ways depending on the specific function exploited - for example, by retrieving sensitive settings and configuration details, or by altering and deleting them, thereby disclosing sensitive information, disrupting the plugin’s functionality, and potentially impacting overall site performance.
Explanation of Vulnerability in Simple Terms
02Summary
WP Compress versions up to 6.30.15 lack proper authorization checks, allowing authenticated users with low privileges to read, modify, or delete site data. An attacker with a basic WordPress account can access sensitive information and alter site functionality without restriction. Update immediately to a version newer than 6.30.15.
What an attacker can do
03Attacker Capabilities
Read, modify, or delete site data and settings without proper permission checks.
Potential impact on your site
04Site Impact
Any registered user can access and alter critical site data, compromising site integrity and confidentiality.
Conditions required to exploit
05Prerequisites
Attacker needs a low-privilege WordPress user account (e.g., subscriber or contributor).
Key dates
06Disclosure timeline
March 26, 2025
CVE published
April 8, 2026
Record updated
