Reported vulnerability
MaxUpload <= 1.4.0 - Unauthenticated Arbitrary File Upload via 'resumableFilename' Parameter
Published 14 Aug 2026
Updated 15 Aug 2026
CVE-2026-15965
Compare your installed software with the affected versions below. Follow the source’s remediation guidance and test an available update after taking a backup. A database entry describes a reported issue; it does not establish whether a particular website has been compromised.
Does this affect my version?
Check your installed version against this advisory. This compares the report’s version ranges and does not scan your website.
Wordfence advisory
high · CVSS 8.8The 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.
Severity vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
MaxUpload – Big File Uploads – Increase Maximum File Upload Size
- Software
- plugin · maxupload-upload-larger-files-easily
- Affected versions
- Start version unspecified, through 1.4.0
- Fix availability
- No fix reported
- Fixed versions
- No fixed version specified
Recommended action
No known patch available. Please review the vulnerability's details in depth and employ mitigations based on your organization's risk tolerance. It may be best to uninstall the affected software and find a replacement.
Further references (1)
Data sources and licences
Copyright 2012-2026 Defiant Inc.
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Read licence termsCopyright 1999-2026 The MITRE Corporation
CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE®). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy.
Read licence termsSource: Wordfence
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Get help with this issueQuestions about this vulnerability
Which versions of MaxUpload – Big File Uploads – Increase Maximum File Upload Size are affected?
Wordfence lists these affected versions: Start version unspecified, through 1.4.0. Use the version checker above to compare your installed release with this report.
Is a fix available for MaxUpload – Big File Uploads – Increase Maximum File Upload Size?
Wordfence does not report a fix for this issue in MaxUpload – Big File Uploads – Increase Maximum File Upload Size. Read the source report and ask the developer or your website support team what action to take.
Where can I find my installed plugin version?
In WordPress, open Plugins > Installed Plugins and find the version shown beneath the plugin name.
Does an affected version mean my website has been hacked?
An affected version means the installed release matches a vulnerability described in this report. It does not show whether anyone has exploited it on your website. The checker compares version numbers with stored reports; it does not inspect your website.