Gravity Forms <= 2.9.30 — Unauthenticated Stored Cross-Site Scripting via Credit Card 'Card Type' Sub-Field

Overview

Advisory ID

CVE-2026-4394

Product

Gravity Forms gravityforms

Affected

≤2.9.30

Fixed in

2.9.31

Weakness

CWE-79 Cross-Site Scripting

Required access

No account needed

Published

Apr 7, 2026 · updated Nov 13, 2026

Credit

Huynh Pham Thanh Luc

Source

Wordfence Intelligence

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.

Not sure which version you run? Run a passive check — it reads public files only.

Remediation & mitigations

1. Update to version 2.9.31, or a newer patched version
2. Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.