CVE-2026-15965
MaxUpload <= 1.4.0 - Unauthenticated Arbitrary File Upload via 'resumableFilename' Parameter
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
CISA's decision points: whether it is exploited, whether attacks can be automated, and how much control an attacker gets. Assessed (SSVC 2.0.3).What do these mean? →
- Exploitation: none
- Automatable: no
- Technical impact: total
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.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: total
- Record last updated
Affected versions
- sadathimel MaxUpload – Big File Uploads – Increase Maximum File Upload Size
through 1.4.0
References 6
plugins.trac.wordpress.org
- browser/maxupload-upload-larger-files-easily/tags/1.4.0/includes/uploader.php#L201
- browser/maxupload-upload-larger-files-easily/tags/1.4.0/includes/uploader.php#L121
- browser/maxupload-upload-larger-files-easily/tags/1.4.0/includes/uploader.php#L174
- browser/maxupload-upload-larger-files-easily/tags/1.4.0/includes/uploader.php#L19
- browser/maxupload-upload-larger-files-easily/tags/1.4.0/maxupload-wp.php#L88