CVE-2026-84434
CriticalExploitedGravity Forms <= 3.1.0.4 - Unauthenticated Arbitrary File Upload via Hidden File Upload Field
Published Sep 19, 2026 · Updated Sep 21, 2026 · Also known as 787e22a9-329b-4e71-bc2a-4f5524fc9356, EUVD-2026-83472, GHSA-x9x4-5g6j-pvj3
Key Facts
Patch immediately- CVE-2026-84434 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting gravityforms (wordpress-plugin), Gravity Forms.
- It is exploited in the wild, listed in Industry KEV feed since Sep 18, 2026. No public exploit code is known.
- EPSS estimates a 3.9% probability of exploitation in the next 30 days.
- Fixed versions are available, including gravityforms 3.1.1.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
3.9%
Exploited in the wild
Yes
1 catalog listing
Public exploit code
None known
Get the full CVE-2026-84434 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| Industry KEV feed | Sep 18, 2026 | n/a | Not reported |
Required action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Affected Products
3 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| gravityformswordpress-plugin | See advisory | 3.1.1 |
| Gravity Forms | See advisory | n/a |
Patched Releases
gravityforms
3.1.1
Timeline
Added to Industry KEV feed
Sep 18, 2026
Publicly disclosed
Sep 19, 2026
Last updated
Sep 21, 2026
Weakness Type
- CWE-434 Unrestricted Upload of File with Dangerous Type
References
- advisoryhttps://patchstack.com/database
- advisoryhttps://wpscan.com/plugins/
- advisoryUSOM advisory
- advisoryhttps://www.wordfence.com/threat-intel/vulnerabilities/
- advisoryhttps://www.wordfence.com/threat-intel/vulnerabilities/id/787e22a9-329b-4e71-bc2a-4f5524fc9356?source=api-prod
FAQ
Common Questions.
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.
Affected: gravityforms (wordpress-plugin); Gravity Forms. The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed since Sep 18, 2026.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including gravityforms 3.1.1.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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