CVE-2026-84999
CriticalCVSS 9.8Summary
The Pie Register Premium plugin for WordPress up to and including 3.8.4.0 is vulnerable to unrestricted file type upload via the piereg_file_upload function. File type validation errors are not checked before move_uploaded_file(), and the AJAX handler lacks nonce and capability checks, allowing unauthenticated attackers to upload PHP files and achieve remote code execution.
Risk Assessment
An attacker can upload a malicious script and gain remote code execution on the server, taking over the site and its data. The risk is critical because no authentication is required.
Recommendation
Update the plugin to a version later than 3.8.4.0 or disable it if no update is available. Additionally, restrict PHP execution in the uploads directory.
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Original NVD description (English source)
The Pie Register Premium plugin for WordPress is vulnerable to Unrestricted File Type Upload in all versions up to, and including, 3.8.4.0 via the piereg_file_upload function. This is due to the plugin performing file type validation via wp_check_filetype and wp_check_filetype_and_ext but never checking whether those validation calls produced errors before move_uploaded_file() is called, combined with no nonce or capability check on the AJAX handler. This makes it possible for unauthenticated attackers to upload files of dangerous types (e.g. PHP scripts) that may be executable, which makes remote code execution possible. The server returns the generated destination filename in the response, giving the attacker the exact path needed to trigger the uploaded file.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

