Description
The Gravity Forms plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 3.1.0.4 via the upload_file function. This is due to a mismatch between the field validation pipeline and the file persistence pipeline, where hidden file upload fields bypass extension validation and a rejected file's intact upload state is later passed to upload_file() without re-validation. This makes it possible for unauthenticated attackers to upload files that may be executable, which makes remote code execution possible. Exploitation requires the targeted form to contain a File Upload field with its Visibility set to 'Hidden'; the vulnerability is reachable by unauthenticated attackers on any publicly accessible form meeting this condition.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Gravity Forms | Gravity Forms | ≤ 3.1.0.4 | — |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
GitHub 1 repository
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murrez/CVE-2026-84434 ★ 0 · Sep 19, 2026
PoC for CVE-2026-84434: unauthenticated arbitrary file upload in Gravity Forms ≤3.1.0.4 via hidden File Upload fields. Python check/exploit/mass scan.
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Automated scanner template
A ready-made Nuclei template detects this vulnerability automatically. Vulnerabilities with public scanner templates are typically probed across the internet soon after the template appears — exposed systems should be patched first.
- WordPress Gravity Forms Plugin <=3.1.0.4 - Unauthenticated Arbitrary File Upload http/cves/2026/CVE-2026-84434.yaml
Source: projectdiscovery/nuclei-templates (MIT) — updated daily. Only links are listed.