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CVE-2026-13238 – Payment Authorization Bypass – Drupal Commerce Realex / Global Payments (version…

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Summary

CVE-2026-13238 is an Incorrect Authorization (Forceful Browsing) vulnerability in the Drupal Commerce Realex / Global Payments payment module, affecting all versions prior to 3.0.2. When the redirect payment method is configured, the module fails to sufficiently verify the authenticity of payment responses returned by Global Payments, allowing an unauthenticated remote attacker to forge a payment confirmation and complete orders without payment. NVD rates this vulnerability Critical with a CVSS v3.1 score of 9.1.

Technical details

  • Root cause: The Commerce Realex / Global Payments module processes payments through Global Payments’ Hosted Payment Page (HPP) using either a lightbox or redirect flow. In the redirect flow, the module does not verify the authenticity of the payment response returned by Global Payments. Version 3.0.2 resolves this by implementing cryptographic verification of redirect responses against the merchant shared secret.
  • Trigger conditions: Exploitation requires the redirect payment method to be configured on the affected site. The lightbox payment method validates response signatures correctly and is not affected by this vulnerability.
  • Attack vector: Network-accessible; no authentication, no privileges, and no user interaction are required (AV:N/AC:L/PR:N/UI:N).
  • Impact: An unauthenticated attacker can forge a payment confirmation response, causing the store to treat fraudulent orders as paid. This results in high integrity and confidentiality impact (C:H/I:H) against e-commerce transaction data, with no availability impact (A:N).

Affected software

  • Commerce Realex / Global Payments for Drupal: all versions prior to 3.0.2

Severity

  • CVSS v3.1 Base Score: 9.1 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Mitigation and recommended actions

  • Immediate: Upgrade the Commerce Realex / Global Payments module to version 3.0.2, which implements cryptographic verification of redirect payment responses against the merchant shared secret.
  • If immediate patching is not possible: Disable the redirect payment gateway configuration and switch to the lightbox payment method, or take the payment endpoint offline until the upgrade can be applied.

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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