Description

SAP Approuter does not sufficiently validate certain incoming requests before forwarding them to backend destinations. Due to the complexity of the required conditions, an attacker with low privileges could send specially crafted requests to bypass authorization checks and reach protected resources beyond their assigned scope. Successful exploitation could allow the attacker to read sensitive data and perform limited modifications on protected resources, resulting in a high impact on confidentiality and a low impact on integrity. There is no impact on availability.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "5.9",
  "pubDate": "2026-08-11T01:17:24.160Z",
  "pubdate": "2026-08-11T01:17:24.160Z",
  "executiveSummary": "An authorization bypass vulnerability exists in SAP Approuter due to insufficient validation of certain incoming HTTP requests prior to forwarding them to backend destinations.\nThe vulnerability allows an authenticated attacker with low privileges to exploit complex conditions by sending specially crafted requests, successfully bypassing intended security controls and reaching protected backend resources outside their assigned authorization scope.\nSuccessful exploitation results in a high impact on confidentiality and a low impact on integrity, enabling unauthorized reading of sensitive data and limited modifications to protected resources, with no impact on system availability.\nThe flaw affects the request routing and validation logic of SAP Approuter, increasing risk exposure within multi-tenant or enterprise environments where strict boundary enforcement is required.\nMitigation requires applying vendor-supplied updates or implementing strict validation checks at the application gateway level.",
  "technicalDetails": "The root cause of the vulnerability lies within the input validation and request handling logic of SAP Approuter, which fails to sufficiently scrutinize incoming requests before proxying them to backend destinations.\nThe vulnerable component is the routing and authorization enforcement mechanism responsible for evaluating user privileges against target backend destinations.\nExploitation requires low privileges and specific, complex conditions under which the Approuter misinterprets the validation state of the incoming request.\nThe attack flow proceeds as follows: First, an attacker authenticates with low privileges to obtain a baseline session or token. Second, the attacker crafts a specialized HTTP request designed to exploit the logic flaw in request validation. Third, the attacker transmits this crafted request to the SAP Approuter instance. Fourth, the Approuter fails to properly validate the request boundaries or permission mappings against the requested resource. Fifth, the Approuter forwards the request to the protected backend destination, bypassing the intended authorization checks. Finally, the backend destination processes the request, granting the attacker unauthorized access to protected resources beyond their assigned scope.\nPost-exploitation impact includes the unauthorized disclosure of sensitive data, yielding a high impact on confidentiality, and the execution of limited modifications on protected resources, resulting in a low impact on integrity.\nNetwork exposure typically involves endpoints exposed to clients accessing enterprise applications through the Approuter gateway.\nNo impact on availability is observed during or after the exploitation of this vulnerability."
}