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CVE-2026-65052 – Payment Calculation Bypass – Ninja Forms WordPress Plugin ≤ 3.14.8

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Summary

CVE-2026-65052 is a high-severity improper input validation vulnerability (CWE-472) in the Ninja Forms WordPress plugin, developed by Saturday Drive, affecting all versions up to and including 3.14.8. Unauthenticated remote attackers can inject arbitrary numeric values into form payment calculations by submitting values that do not match any admin-configured option in ListSelect or ListRadio fields, causing the plugin’s get_calc_value() method to fail open and return attacker-controlled totals. With over 600,000 active installations, the plugin represents significant internet-facing attack surface, and a patched version (3.14.9) has been released.

Technical details

  • Root cause: The get_calc_value() method in Ninja Forms’ calculation logic does not validate that submitted field values correspond to any option configured by the site administrator. When a submitted value fails to match a known option, the method fails open rather than rejecting the input, returning the attacker-supplied value directly.
  • Trigger conditions: Exploitation requires the target site to use Ninja Forms with payment-enabled forms that include ListSelect or ListRadio fields tied to calculation logic and a payment gateway (e.g., Stripe, PayPal, Authorize.net, or Elavon add-ons).
  • Attack vector: Unauthenticated attackers send a crafted HTTP POST request to the publicly accessible WordPress AJAX endpoint (wp-admin/admin-ajax.php with action nf_ajax_submit), manipulating the field value payload for ListSelect or ListRadio fields to inject an arbitrary numeric amount.
  • Impact: An attacker can manipulate the payment total processed by the form to zero or any arbitrary figure, effectively bypassing admin-configured pricing logic. This enables unauthenticated financial fraud — purchasing goods or services at no cost — against any site using affected payment forms.

Affected software

  • Ninja Forms (WordPress plugin by Saturday Drive) — all versions ≤ 3.14.8

Severity

  • CVSS v4.0: 8.7 (HIGH) — CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
  • CVSS v3.1: 7.5 (HIGH) — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Mitigation and recommended actions

  • Immediate: Update Ninja Forms to version 3.14.9 or later. The fix, released on July 14, 2026, introduces validation to block calc value injection in list fields. Version 3.14.10 (July 27, 2026) is the latest available release.
  • If immediate patching is not possible: Disable payment-collection forms that use ListSelect or ListRadio fields with calculation-based pricing until the plugin can be updated. Review form submission logs for anomalous payment totals (e.g., $0.00 submissions) as an indicator of exploitation attempts.
  • Scope assessment: Not all Ninja Forms deployments are affected — exploitation requires the specific combination of ListSelect/ListRadio fields, calculation actions, and a payment gateway add-on. Site administrators should audit their active form configurations to determine whether they are exposed.

IONIX Status

The IONIX research team is tracking ongoing exploitation attempts and recommends immediate patching. Potentially affected assets are outlined in this post.

References

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