WordPress MaxUpload plugin <= 1.4.0 - Unauthenticated Arbitrary File Upload via 'resumableFilename' Parameter vulnerability

Unauthenticated Arbitrary File Upload via 'resumableFilename' Parameter vulnerability discovered by JIWOONG LEE kimchunbok - Hyundai Red Team in WordPress Plugin MaxUpload versions = 1.4.0...

CVE-2026-15965 MaxUpload <= 1.4.0 - Unauthenticated Arbitrary File Upload via 'resumableFilename' Parameter

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 handleupload function. This is due to a filename-validation mismatch in the handleupload function where extension an...