What the vulnerability does
01Description
The Advanced Custom Fields (ACF®) plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 6.8.1. This is due to the plugin not properly verifying that a user is authorized to perform an action. This makes it possible for unauthenticated attackers to overwrite the post_title and post_content of any post bound to a publicly accessible acf_form() instance by injecting values into the _post_title and _post_content parameters of a form submission request.
Explanation of Vulnerability in Simple Terms
02Summary
Advanced Custom Fields (ACF) versions 6.8.1 and earlier lack proper authorization checks, allowing unauthenticated attackers to modify data through the network. The vulnerability does not expose sensitive information or disrupt availability, but permits unauthorized changes to site content or configuration. Site administrators should update to a version newer than 6.8.1.
What an attacker can do
03Attacker Capabilities
Modify site data or settings without authentication.
Potential impact on your site
04Site Impact
Unauthorized changes to custom field data, posts, or plugin settings without your knowledge.
Conditions required to exploit
05Prerequisites
Network access only; no authentication or user interaction required.
Key dates
06Disclosure timeline
May 31, 2026
CVE published
June 1, 2026
Record updated
