CVE-2026-18983 File upload in One User Avatar | User Profile Picture
Authenticated attackers can upload malicious files to achieve remote code execution if admins enable subscriber avatar uploads.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-18983?
CVE-2026-18983 is a high-severity vulnerability in onedesigns One User Avatar | User Profile Picture, published on 28 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Weakness: CWE-434
Which versions are affected by CVE-2026-18983?
How do I fix CVE-2026-18983?
No fix has been published for CVE-2026-18983 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-18983 being exploited?
There is no known exploitation of CVE-2026-18983 in the wild and no public exploit code.
Sources
Also known as GHSA-p2qh-mgvf-5q7f.