Exploited vulnerability

CVE-2026-4394

TLP:CLEAR

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

The Gravity Forms plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the Credit Card field's 'Card Type' sub-field (`input_.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_.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.

Facts

Vendor: Gravity Forms
Product: Gravity Forms
EPSS (probability of exploitation within 30 days): 0.3 %
First known exploitation: 13 October 2026
First seen by Risk Letters: 13 October 2026

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Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD