CVE-2026-15965
Received Received - Intake

Arbitrary File Upload in MaxUpload WordPress Plugin

Publication date: 2026-08-15

Last updated on: 2026-08-15

Assigner: Wordfence

Description
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.

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Meta Information

Published
2026-08-15
Last Modified
2026-08-15
Generated
2026-08-15
AI Q&A
2026-08-15
EPSS Evaluated
N/A
NVD
CVE-2026-15965
EUVD
EUVD-2026-58837

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
wp_maxupload big_file_uploads to 1.4.0 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-434 The product allows the upload or transfer of dangerous file types that are automatically processed within its environment.

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Executive Summary

This WordPress plugin vulnerability allows unauthenticated attackers to upload executable files by exploiting a filename-validation mismatch. The plugin checks uploaded chunk filenames but fails to validate the final assembled filename, enabling remote code execution.

Impact Analysis

Attackers could upload malicious files to your WordPress site, potentially gaining control over it. This could lead to website defacement, data theft, or further attacks against visitors.

Mitigation Strategies

Immediately update the MaxUpload plugin to the latest version beyond 1.4.0 if an update is available. If no update exists, consider disabling or removing the plugin until a patch is released. Review uploaded files for suspicious executables and restrict file upload permissions.

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