CVE-2026-82213 in Nexi XPay Build Plugin
Summary
by MITRE • 09/11/2026
The Nexi XPay Build WordPress plugin from 7.6.1 to 7.6.2 does not verify that the saved payment token being requested belongs to the current user, allowing unauthenticated attackers to retrieve other customers' stored card token references together with a valid authorisation signature.
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Analysis
by VulDB Data Team • 09/11/2026
The vulnerability identified in Nexi XPay Build WordPress plugin versions ranging from 7.6.1 to 7.6.2 represents a critical failure in access control mechanisms, specifically categorized under CWE-284 Improper Access Control. This flaw stems from the application's inability to properly validate that payment token requests are associated with the authenticated user initiating them. In secure web applications, any operation involving sensitive data such as stored credit card tokens must enforce strict ownership verification to prevent unauthorized access. The absence of this check allows an attacker to bypass authentication requirements entirely or exploit existing sessions to manipulate system behavior beyond their intended permissions.
From a technical perspective, the core issue lies in how the plugin handles requests for saved payment token references. When a user interacts with the checkout process or manages stored payment methods, the backend logic retrieves specific token identifiers linked to that customer's account. However, due to insufficient validation of the relationship between the requesting entity and the target resource, an unauthenticated attacker can craft malicious HTTP requests specifying arbitrary token IDs belonging to other customers. The system processes these requests without confirming ownership, thereby exposing sensitive financial data. This type of flaw is often referred to as a Broken Object Level Authorization (BOLA) or Insecure Direct Object Reference (IDOR), where the application relies on client-supplied identifiers rather than server-side session context to determine access rights.
The operational impact of this vulnerability is severe, primarily due to the additional factor that these exposed token references are accompanied by valid authorization signatures. Payment tokens serve as proxies for actual credit card numbers during transactions, and when combined with a valid signature, they can potentially be used to authorize fraudulent payments or manipulate transaction states depending on how downstream systems utilize them. Even if direct financial theft is not immediately possible through the token alone, the exposure of customer payment data constitutes a significant privacy breach and regulatory violation under standards such as PCI DSS. Attackers could use this information for targeted phishing campaigns, social engineering attacks, or further exploitation within integrated e-commerce workflows that trust these tokens implicitly.
This vulnerability aligns with several entries in the MITRE ATT&CK framework, particularly those related to Collection of Payment Card Information and Unsecured Credentials. The ability to retrieve stored credentials without proper authentication highlights a fundamental weakness in identity verification processes. It demonstrates how attackers can leverage improper access controls to gather intelligence on victim financial profiles, which is often a precursor to more sophisticated fraud schemes. The presence of valid authorization signatures further complicates remediation efforts because it suggests that the cryptographic integrity checks are functioning correctly but are being applied to unauthorized contexts rather than preventing them at the logic layer.
Mitigation strategies must focus on implementing robust server-side validation for all resource access operations. Developers should ensure that every request involving sensitive data, such as payment tokens, includes a verification step that cross-references the requested resource ID with the identity of the authenticated user session. This involves checking database records to confirm ownership before returning any information or executing transactional logic. Additionally, implementing rate limiting and monitoring for anomalous access patterns can help detect exploitation attempts in real-time. For organizations using this plugin version, immediate updates to patched versions are essential, along with a thorough audit of other endpoints that handle user-specific data to ensure similar flaws do not exist elsewhere in the application architecture.