Gravity Forms <= 2.9.30 - Unauthenticated Stored Cross-Site Scripting via Credit Card 'Card Type' Sub-Field
| CVE | CVE-2026-4394 |
|---|---|
| CVSS | 6.1 (Medium) |
| Publicly Published | April 7, 2026 |
| Last Updated | April 7, 2026 |
| Researcher |
Luc Huynh from Noventiq RedTeam
- Noventiq Vietnam
|
Description
The Gravity Forms plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the Credit Card field's 'Card Type' sub-field (`input_<id>.4`) in all versions up to, and including, 2.9.30. This is due to the `get_value_entry_detail()` method in the `GF_Field_CreditCard` class outputting the card type value without escaping, combined with `get_value_save_entry()` accepting and storing unsanitized user input for the `input_<id>.4` parameter. The Card Type field is not rendered on the frontend form (it is normally derived from the card number), but the backend submission parser blindly accepts it if included in the POST request. This makes it possible for unauthenticated attackers to inject arbitrary web scripts that execute when an administrator views the form entry in the WordPress dashboard.
Learn more about Cross-Site Scripting vulnerabilities and how to prevent them.
References
- plugins.trac.wordpress.org
- plugins.trac.wordpress.org
- plugins.trac.wordpress.org
- plugins.trac.wordpress.org
- docs.gravityforms.com
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Vulnerability Details for Gravity Forms
| Software Type | Plugin |
|---|---|
| Software Slug | gravityforms |
| Patched? | Yes |
| Remediation | Update to version 2.9.31, or a newer patched version |
| Affected Version |
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| Patched Version |
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Recent vulnerabilities in Gravity Forms
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