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 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.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| WordPress plugin | MaxUpload – Big File Uploads – Increase Maximum File Upload Size | <= 1.4.0 | no fix |
References
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H- Weakness (CWE)
CWE-434- Platform
- WordPress
- Package
MaxUpload – Big File Uploads – Increase Maximum File Upload Size- Disclosed
- 14.08.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
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Vulnerability history: MaxUpload – Big File Uploads – Increase Maximum File Upload Size
All published vulnerabilities of this package (WordPress plugin), newest first. Shows whether this is a one-off slip or a package that needs watching.
This is the only known vulnerability of this package.
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