Description
The Multi Uploader for Gravity Forms plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 1.1.9 via the move_file function. This is due to insufficient file type validation during chunked upload handling. This makes it possible for unauthenticated attackers to upload arbitrary files on the affected site's server which may make remote code execution possible.
References6
- plugins.trac.wordpress.org/browser/gf-multi-uploader/tags/1.1.9…
- plugins.trac.wordpress.org/browser/gf-multi-uploader/tags/1.1.9…
- plugins.trac.wordpress.org/browser/gf-multi-uploader/tags/1.1.9…
- plugins.trac.wordpress.org/browser/gf-multi-uploader/tags/1.1.9…
- plugins.trac.wordpress.org/browser/gf-multi-uploader/tags/1.1.9…
- www.wordfence.com/threat-intel/vulnerabilities/id/47337bc1-fa3d…
Metrics
- CVSS 3.1
-
9.8
CRITICAL
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 1% percentile: 67 · as of 8 November 2026
- CWE
- CWE-434
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.