CVE-2025-26656 in S4HANA
Summary
by MITRE • 03/11/2025
OData Service in Manage Purchasing Info Records does not perform necessary authorization checks for an authenticated user, allowing an attacker to escalate privileges. This has low impact on integrity of the application.
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Analysis
by VulDB Data Team • 03/11/2025
The vulnerability identified as CVE-2025-26656 resides within the OData service implementation of the Manage Purchasing Info Records functionality, representing a critical authorization bypass flaw that undermines the security posture of the affected system. This issue manifests when authenticated users attempt to access purchasing information records through the OData interface without proper authorization validation, creating a pathway for privilege escalation attacks. The vulnerability specifically affects the authorization controls that should normally validate user permissions before granting access to sensitive purchasing data, thereby allowing unauthorized access to procurement information that should be restricted based on user roles and responsibilities.
The technical flaw stems from inadequate input validation and authorization enforcement mechanisms within the OData service layer, where the system fails to properly verify whether authenticated users possess the necessary privileges to access specific purchasing records. This authorization gap creates a condition where users can potentially bypass normal access controls and retrieve information that exceeds their legitimate business requirements. The vulnerability operates at the application layer and leverages the OData protocol's capabilities to query and manipulate purchasing data, making it particularly dangerous as it can be exploited through standard web-based attack vectors. The flaw is classified under CWE-285 which specifically addresses improper authorization scenarios in software applications, aligning with the broader category of access control vulnerabilities that represent one of the most common attack surfaces in enterprise applications.
From an operational impact perspective, this vulnerability enables attackers to escalate privileges and gain unauthorized access to sensitive procurement data, potentially exposing confidential purchasing information, vendor details, and financial records. The low impact on application integrity suggests that while attackers can access restricted data, they cannot directly modify or corrupt the underlying data structures, though the information disclosure aspect remains significant. The vulnerability affects organizations that rely on proper segregation of duties for procurement processes, as it allows users to potentially access purchasing records outside their designated scope, creating risks for data confidentiality and business process integrity. This type of authorization bypass can facilitate further attacks including data exfiltration, insider threat exploitation, or lateral movement within the network infrastructure.
Mitigation strategies should prioritize immediate implementation of proper authorization checks within the OData service interface, ensuring that all requests are validated against user permissions before data access is granted. Organizations should implement role-based access controls that enforce the principle of least privilege, restricting access to purchasing records based on user roles and business requirements. The solution involves strengthening the authorization layer to validate user credentials and permissions for each OData request, potentially utilizing existing authentication frameworks or implementing custom authorization middleware. Security patches should address the core authorization bypass issue by ensuring that the Manage Purchasing Info Records service properly validates access rights before returning any purchasing information. Additionally, monitoring and logging mechanisms should be enhanced to detect unauthorized access attempts, and security teams should conduct regular access control reviews to identify potential privilege escalation paths that could be exploited through similar vulnerabilities. This remediation approach aligns with the ATT&CK framework's privilege escalation techniques, specifically targeting the T1078 and T1566 sub-techniques that focus on legitimate credentials and valid accounts as entry points for unauthorized access.