CVE-2026-15965
HighCVSS 8.8Exploitation Probability (EPSS)
Low risk45th percentile - higher than 45% of all known CVEs
Summary
The MaxUpload plugin for WordPress up to version 1.4.0 is vulnerable to arbitrary file upload via the handle_upload function. Filename validation is inconsistent – extension and MIME checks apply to the uploaded chunk's filename, not to the final assembled filename from the resumableFilename parameter. This allows unauthenticated attackers to upload executable files, potentially leading to remote code execution.
Risk Assessment
An attacker can upload a malicious executable file to the server, potentially leading to full compromise of the WordPress site.
Recommendation
Update the MaxUpload plugin to the latest patched version. Restrict file upload access to trusted users only.
Original NVD description (English source)
The MaxUpload – Big File Uploads – Increase Maximum File Upload Size plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 1.4.0 via the handle_upload function. This is due to a filename-validation mismatch in the handle_upload function where extension and MIME checks are applied to the uploaded chunk's filename but not to the final assembled filename derived from the resumableFilename parameter. This makes it possible for unauthenticated attackers to upload files that may be executable, which makes remote code execution possible.