CVE-2026-73475 in Commerce PayPal Module
Summary
by MITRE • 09/02/2026
Incorrect Authorization vulnerability in Drupal Commerce PayPal allows Forceful Browsing. This issue affects Commerce PayPal versions: from 0.0.0 to 1.12.0, from 2.0.0 to 2.1.3.
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Analysis
by VulDB Data Team • 09/02/2026
The identified security flaw within the Drupal Commerce PayPal module represents a critical failure in access control mechanisms, specifically categorized under CWE-639 as Authorization Bypass Through Forceful Browsing or Clickjacking. This vulnerability exists across multiple versions of the module, including those ranging from version 0.0.0 to 1.12.0 and from 2.0.0 to 2.1.3. The core issue stems from insufficient server-side validation when handling requests related to payment processing or status updates initiated by PayPal's webhook system. In a properly secured implementation, the application must verify that any incoming request claiming to be an official notification from the payment gateway is authenticated and authorized before executing sensitive logic such as order state changes or inventory adjustments. However, in these affected versions, the module fails to strictly enforce this authorization check on certain endpoints, allowing external actors to manipulate transaction states without valid credentials or proper cryptographic verification.
From a technical perspective, the vulnerability allows an attacker to perform forceful browsing against specific API endpoints exposed by the Commerce PayPal integration. By crafting and sending HTTP requests directly to these endpoints with manipulated parameters, such as altering order IDs, payment statuses, or amounts, an unauthorized user can trick the system into believing that legitimate transactions have occurred or been completed. This bypasses the intended security controls because the application relies on implicit trust in the source of the request rather than validating the integrity and authenticity of each individual message. The absence of robust signature verification for webhook payloads means that malicious actors can forge responses, potentially leading to unauthorized order completions, incorrect financial reporting, or manipulation of customer purchase histories. This type of attack aligns with MITRE ATT&CK technique T1078, Valid Accounts, as it involves the misuse of legitimate system functions by an entity lacking proper privileges, effectively exploiting trust relationships within the application architecture.
The operational impact of this vulnerability is significant for e-commerce platforms relying on Drupal Commerce and PayPal integration. Successful exploitation could result in financial loss through fraudulent order processing where goods are shipped without actual payment confirmation or refunds are issued incorrectly due to manipulated status updates. Additionally, it compromises data integrity by allowing unauthorized modifications to transaction records, which can disrupt inventory management systems and lead to stock discrepancies. For businesses, this translates into potential revenue leakage, increased customer service overhead for resolving disputes arising from fraudulent activities, and reputational damage if customers perceive the platform as insecure. The ability to forceful browse these endpoints also opens avenues for further attacks, such as denial of service by flooding the system with fake transaction requests or escalating privileges within the application logic if other related vulnerabilities exist in conjunction with this authorization flaw.
Mitigation strategies must focus on immediate remediation through software updates and enhanced security configurations. The primary recommendation is to upgrade the Commerce PayPal module to a version that explicitly addresses these authorization checks, ensuring that all webhook endpoints require strict validation of incoming requests against known digital signatures provided by PayPal. Administrators should also implement network-level controls such as IP whitelisting for payment gateway callbacks if supported by their infrastructure, adding an additional layer of defense in depth. Furthermore, integrating robust logging and monitoring solutions can help detect anomalous patterns indicative of forceful browsing attempts, allowing security teams to respond proactively. Regular audits of access control lists and adherence to OWASP guidelines for API security are essential to prevent similar authorization bypasses in future development cycles, ensuring that every interaction with external services is rigorously authenticated and authorized before any state-changing operations are executed.