CVE-2026-66473 in Payment Plugin
Summary
by MITRE • 07/28/2026
Unauthenticated Broken Access Control in Xendit Payment <= 7.1.0 versions.
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Analysis
by VulDB Data Team • 07/28/2026
The vulnerability identified as unauthenticated broken access control in Xendit Payment versions 7.1.0 and earlier represents a critical security flaw that undermines the fundamental principles of access control mechanisms within the payment processing system. This weakness allows attackers to bypass authentication requirements and gain unauthorized access to sensitive functionalities and data without proper authorization. The issue stems from inadequate validation of user credentials and session management, creating pathways for malicious actors to exploit the system's access controls. According to CWE-284, this vulnerability falls under improper access control classifications where the system fails to properly enforce access restrictions on resources and operations. The impact extends beyond simple unauthorized access as it potentially enables attackers to manipulate payment transactions, view confidential customer information, and disrupt normal business operations.
The technical implementation of this broken access control manifests through insufficient validation checks within the authentication flow and lack of proper authorization enforcement at various endpoints. Attackers can exploit this vulnerability by crafting malicious requests that circumvent standard authentication mechanisms, potentially accessing administrative functions or sensitive data that should only be available to authorized users. The flaw likely exists in how the system validates session tokens, handles API requests, or manages user roles and permissions. This type of vulnerability aligns with ATT&CK technique T1078 which covers legitimate credentials usage and privilege escalation through compromised access control mechanisms. The system's failure to properly validate incoming requests and enforce role-based access controls creates multiple attack vectors that can be leveraged to achieve unauthorized system access.
The operational impact of this vulnerability is severe and multifaceted, potentially exposing organizations to financial losses, data breaches, and regulatory compliance violations. Payment processing systems handling sensitive financial transactions are particularly vulnerable to exploitation, as attackers could manipulate transaction records, redirect payments, or extract customer payment information. The consequences extend beyond immediate financial harm to include reputational damage, legal liability, and potential criminal prosecution under various cybersecurity regulations including PCI DSS requirements. Organizations may face significant penalties for failing to maintain proper access controls as mandated by industry standards and regulatory frameworks. The vulnerability's exploitation could result in large-scale fraud operations and compromise the integrity of entire payment ecosystems that rely on trust and security.
Mitigation strategies must address both immediate remediation and long-term architectural improvements to prevent similar vulnerabilities from reoccurring. Organizations should implement comprehensive authentication and authorization frameworks with proper session management, enforce strict input validation, and establish robust logging and monitoring capabilities. The solution requires deploying multi-factor authentication mechanisms, implementing proper role-based access controls, and ensuring all API endpoints validate user permissions before processing requests. Regular security testing including penetration testing and vulnerability assessments should be conducted to identify and remediate access control weaknesses proactively. Organizations must also establish incident response procedures specifically designed to handle access control breaches and ensure compliance with relevant security standards such as ISO 27001, NIST cybersecurity framework, and industry-specific regulations governing payment processing systems. The fix should include implementing proper error handling that does not reveal system internals or provide attackers with information about valid endpoints or access patterns.