CVE-2026-76969 in Cloud Application Programming Model
Summary
by MITRE • 09/08/2026
@sap/cds-mtxs NPM library does not perform sufficient checks on certain functionality used in multitenant CAP applications with extensibility enabled. An unauthenticated attacker could send specially crafted requests to obtain sensitive credentials and abuse them to replace or delete tenant data. Successful exploitation can result in a high impact on availability and integrity of the application. There may also be partial impact to the confidentiality of business data.
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Analysis
by VulDB Data Team • 09/08/2026
The vulnerability identified within the @sap/cds-mtxs NPM library represents a critical security flaw rooted in insufficient input validation and access control mechanisms for multitenant Cloud Application Programming Model (CAP) applications that have extensibility features enabled. This specific component is designed to manage tenant-specific data and configurations, but it fails to adequately verify the authenticity or authorization of requests targeting certain internal functionalities. The core technical deficiency lies in the library's failure to enforce strict authentication requirements on endpoints that handle sensitive operational tasks, such as credential management and data modification operations. By allowing unauthenticated actors to interact with these functions, the system exposes a direct pathway for attackers to bypass standard security boundaries inherent in multitenant architectures where isolation between tenants is paramount.
An attacker exploiting this vulnerability can send specially crafted HTTP requests to manipulate the application's state without providing valid credentials or session tokens. The primary consequence of this lack of authentication enforcement is the ability to obtain sensitive credentials stored within the system, which are typically used for service-to-service communication or database access. Once these credentials are extracted, they serve as a powerful tool for further exploitation. With possession of these high-privilege keys, an attacker can authenticate as legitimate services and proceed to replace critical tenant data with malicious content or delete essential records entirely. This capability effectively neutralizes the integrity protections intended by the application's design, allowing for arbitrary modification or destruction of business-critical information belonging to specific tenants.
The operational impact of this vulnerability is severe, particularly regarding the availability and integrity aspects of the CIA triad. The ability to delete tenant data can lead to significant service disruptions, causing downtime for affected users and potentially resulting in permanent loss of historical records if backups are not immediately available or restorable. Furthermore, the replacement of data introduces a high risk of business logic corruption, where applications may function incorrectly due to malformed or malicious inputs injected into their databases. While confidentiality is partially impacted through the initial theft of credentials, the broader scope includes potential exposure of sensitive business data if those stolen credentials are used to access other protected resources within the tenant's environment. This creates a cascading failure scenario that extends beyond the immediate application layer to affect downstream systems and user trust.
From a classification perspective, this vulnerability aligns with CWE-287, which describes Improper Authentication, as the system fails to correctly verify identity before granting access to sensitive functions. It also relates closely to CWE-601, URL Redirection to Untrusted Site, if the extensibility features involve external resource loading or configuration that can be hijacked, though the primary issue is authentication bypass. In terms of offensive security frameworks, this exploitation path corresponds to MITRE ATT&CK technique T1078, Valid Accounts, where attackers leverage stolen credentials to maintain persistence and move laterally within the environment. The attack vector falls under Initial Access or Privilege Escalation depending on whether the initial credential theft is considered part of gaining foothold or escalating privileges post-compromise.
To mitigate this risk, immediate action must be taken by developers and security teams managing applications dependent on @sap/cds-mtxs. The most effective remediation involves upgrading to a patched version of the library that enforces strict authentication checks on all sensitive endpoints related to multitenant management and extensibility features. Until an update is applied, organizations should implement network-level controls such as Web Application Firewalls (WAF) rules to block requests lacking valid authentication headers for these specific paths. Additionally, rotating any potentially compromised credentials immediately is essential to prevent further abuse by attackers who may have already exploited the flaw in live environments. Regular security audits focusing on input validation and access control lists are recommended to ensure no similar gaps exist in other parts of the application architecture.