Gravity Forms Plugin up to 3.1.0.4 on WordPress upload_file unrestricted upload

Summaryinfo

A vulnerability labeled as critical has been found in Gravity Forms Plugin up to 3.1.0.4. This affects the function upload_file. The manipulation results in unrestricted upload. This vulnerability is cataloged as CVE-2026-84434. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability classified as critical has been found in Gravity Forms Plugin up to 3.1.0.4. Affected is the function upload_file. The manipulation with an unknown input leads to a unrestricted upload vulnerability. CWE is classifying the issue as CWE-434. The product allows the attacker to upload or transfer files of dangerous types that can be automatically processed within the product's environment. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at wordfence.com. This vulnerability is traded as CVE-2026-84434 since 09/01/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 09/19/2026). The MITRE ATT&CK project declares the attack technique as T1608.002.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• WordPress Plugin

Name

• Gravity Forms Plugin

Version

• 3.1.0.0
• 3.1.0.1
• 3.1.0.2
• 3.1.0.3
• 3.1.0.4

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Once again VulDB remains the best source for vulnerability data.

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