What the vulnerability does
01Description
The Advanced Country Blocker plugin for WordPress is vulnerable to Authorization Bypass in all versions up to, and including, 2.3.1 due to the use of a predictable default value for the secret bypass key created during installation without requiring users to change it. This makes it possible for unauthenticated attackers to bypass the geolocation blocking mechanism by appending the key to any URL on sites where the administrator has not changed the default value.
Explanation of Vulnerability in Simple Terms
02Summary
Advanced Country Blocker versions 2.3.1 and earlier contain an integrity vulnerability that allows an attacker to modify data on the site without authentication. The vulnerability requires only network access and no user interaction. Site administrators should update to a version newer than 2.3.1 to mitigate this risk.
What an attacker can do
03Attacker Capabilities
Modify data or content on the site without needing to log in.
Potential impact on your site
04Site Impact
Attackers can alter site content, settings, or data without your knowledge or permission.
Conditions required to exploit
05Prerequisites
Network access to the site; no authentication or user interaction required.
Key dates
06Disclosure timeline
February 7, 2026
CVE published
April 8, 2026
Record updated
