CVE-2026-15965 json
MaxUpload <= 1.4.0 - Unauthenticated Arbitrary File Upload via 'resumableFilename' Parameter
published 2026-08-15 2 mo ago modified 2026-08-20 2 mo ago also EUVD-2026-58837
- cvss
- 8.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.0%
- EPSS 1.0% chance of exploitation in 30 days, percentile 63%
- public exploits
- 0
- none known
Summary
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.
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 2 mo ago
Exploit prediction
1.03% chance of exploitation in the next 30 days, higher than 63% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Affected products
- sadathimel MaxUpload – Big File Uploads – Increase Maximum File Upload Size
Classification
- Weakness
-
- CWE-434 Unrestricted Upload of File with Dangerous Type
- Technology feeds
References
- wordfence.com /threat-intel/vulnerabilities/id/70d90c0c-e3c6-4db9-b16d-1442e7e1dc3b?source=cve
- plugins.trac.wordpress.org /browser/maxupload-upload-larger-files-easily/tags/1.4.0/includes/uploader.php#L201
- plugins.trac.wordpress.org /browser/maxupload-upload-larger-files-easily/tags/1.4.0/includes/uploader.php#L121
- plugins.trac.wordpress.org /browser/maxupload-upload-larger-files-easily/tags/1.4.0/includes/uploader.php#L174
- plugins.trac.wordpress.org /browser/maxupload-upload-larger-files-easily/tags/1.4.0/includes/uploader.php#L19
- plugins.trac.wordpress.org /browser/maxupload-upload-larger-files-easily/tags/1.4.0/maxupload-wp.php#L88
Sources
- CVE List CVE-2026-15965
- NVD CVE-2026-15965
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.