Description

Vulnerability in Drupal Commerce Elavon. This issue affects Commerce Elavon versions: *.*.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "9.8",
  "pubDate": "2026-08-25T23:16:56.900Z",
  "pubdate": "2026-08-25T23:16:56.900Z",
  "executiveSummary": "The Drupal Commerce Elavon module contains an unspecified vulnerability affecting all versions of the product. This module is designed to integrate the Elavon payment gateway with the Drupal Commerce ecosystem. The vulnerability poses a significant risk to the integrity and confidentiality of financial transaction data processed through the site.\nThe nature of this vulnerability suggests a flaw in the communication protocol, input handling, or callback mechanism utilized by the Elavon payment gateway integration. Successful exploitation could potentially allow an unauthenticated or authenticated attacker to manipulate payment parameters, bypass security checks, or access sensitive transaction information.\nGiven that this module handles financial interactions, the risk implications are critical. An attacker may be capable of performing unauthorized transaction modifications or exposing customer payment data. Exploitation likely requires the attacker to intercept or forge communications between the Drupal site and the Elavon payment processing service, necessitating a specific configuration or network positioning. Users are advised to exercise caution and monitor for anomalous transaction activity.",
  "technicalDetails": "The Commerce Elavon module facilitates secure communication between the Drupal Commerce checkout workflow and the Elavon payment gateway. Vulnerabilities in such integrations typically stem from insecure implementation of the Payment Notification (IPN) handlers, insufficient validation of transaction signatures, or flawed cryptographic verification of API responses. Because the module relies on callback endpoints to verify the success or failure of a transaction, a failure to properly authenticate the origin of these requests is a common root cause.\nThe attack flow generally involves an attacker intercepting the asynchronous HTTP POST requests sent from the Elavon backend to the Commerce Elavon module. If the module does not strictly enforce the validation of HMAC signatures or other cryptographic tokens provided by the gateway, an attacker can forge a 'success' response for a malicious or unpaid transaction. This allows the attacker to complete the checkout process without actual payment transfer.\nFurthermore, if the module improperly handles input data during the redirection process from the Drupal site to the Elavon payment page, it may be susceptible to parameter tampering. By modifying specific fields (such as currency codes or total transaction amounts) before the request is signed and sent, an attacker might influence the final processing state. The vulnerable component is the integration logic located within the module’s payment gateway controller classes.\nRegarding network exposure, the vulnerable endpoints are typically exposed over HTTPS, which is standard for payment processing. Authentication requirements depend on whether the flaw exists in the storefront-facing initiation phase or the server-to-server callback phase. If the flaw resides in the callback handler, it is often accessible via the public network without specific session-based authentication, provided the attacker can guess or discover the module's callback URL structure. Post-exploitation impact ranges from fraudulent orders and financial loss to potential data breaches if customer PII (Personally Identifiable Information) associated with the transaction metadata is exposed through the manipulated endpoint."
}