What the vulnerability does
01Description
The One User Avatar | User Profile Picture plugin for WordPress is vulnerable to Stored Cross-Site Scripting in all versions up to, and including, 2.5.4 via the wpua_action_process_option_update function. This is due to insufficient file type validation in wp_handle_upload() called without a MIME allow-list, with post-write validation relying on the attacker-controlled client-supplied Content-Type header rather than a server-derived type, and no cleanup of files that fail the check. This makes it possible for authenticated attackers, with subscriber-level access and above, to upload files that may be executable, which makes remote code execution possible. in order to exploit this vulnerability an admin has to give subscribers permission to upload avatars. While PHP files and svg files are rejected, dxfp files are accepted.
Explanation of Vulnerability in Simple Terms
02Summary
The One User Avatar plugin for WordPress contains an unrestricted file upload vulnerability in versions up to 2.5.4. Authenticated users with low privileges can upload files of dangerous types, including executable code. An attacker can exploit this to run their own PHP code on the site, potentially compromising the entire WordPress installation. Update to a version newer than 2.5.4.
What an attacker can do
03Attacker Capabilities
Upload and execute malicious files on the site, gaining control over WordPress.
Potential impact on your site
04Site Impact
Attackers with basic user accounts can run arbitrary code and take over your WordPress site.
Conditions required to exploit
05Prerequisites
Attacker must have a low-privilege WordPress user account (e.g., subscriber or contributor).
Key dates
06Disclosure timeline
August 28, 2026
CVE published
