What the vulnerability does
01Description
The ARMember plugin for WordPress is vulnerable to Directory Traversal in all versions up to, and including, 4.0.27 via the 'X-FILENAME' HTTP header. This makes it possible for unauthenticated attackers to upload and overwrite certain files (e.g., CSS) to directories outside the 'wp-content/uploads/armember' directory.
Explanation of Vulnerability in Simple Terms
02Summary
ARMember versions up to 4.0.27 contain a path traversal vulnerability that allows unauthenticated attackers to modify files on the site through network requests. No user interaction is required. The vulnerability affects the plugin's file handling logic and can result in unauthorized changes to site content or configuration.
What an attacker can do
03Attacker Capabilities
Modify files on the site without authentication.
Potential impact on your site
04Site Impact
Attackers can alter site files, potentially compromising content, configuration, or functionality without your knowledge.
Conditions required to exploit
05Prerequisites
Network access to the site; no authentication or user interaction required.
Key dates
06Disclosure timeline
July 10, 2026
CVE published