Description

Reprocess Bank Statement Items in SAP S/4HANA does not perform the necessary authorization checks for authenticated users, allowing them to use rules that have not been shared with them, resulting in privilege escalation.This vulnerability has a low impact on confidentiality, with no impact on integrity and availability of the application

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "4.3",
  "pubDate": "2026-08-11T01:17:23.120Z",
  "pubdate": "2026-08-11T01:17:23.120Z",
  "executiveSummary": "A privilege escalation vulnerability exists within the Reprocess Bank Statement Items functionality of SAP S/4HANA. The security flaw stems from an absence of proper authorization validation checks for authenticated users interacting with application rules. Specifically, the system fails to enforce access control lists, allowing users to leverage and execute rules that have not been explicitly shared with their accounts. This breakdown in access control grants unauthorized users capabilities outside their intended privilege level within the financial processing workflow.\nThe business risk involves unauthorized access to processing logic and potential manipulation of financial data handling paths through unshared rules. However, the impact is strictly scoped. According to the assessment, the vulnerability poses a low impact on confidentiality, with no associated impact on the integrity or availability of the application. Exploitation requires the adversary to be an authenticated user within the system, possessing network access to the SAP S/4HANA application layer. No specific complex attack preconditions beyond standard session authentication are mandated to abuse the missing authorization checks.",
  "technicalDetails": "The vulnerability resides in the authorization enforcement mechanisms governing rule management within the Reprocess Bank Statement Items component of SAP S/4HANA. The root cause of the security defect is a failure of the underlying business logic and access control implementation to validate whether the current authenticated user possesses explicit execution rights or ownership over specific rule entities before processing them.\nDuring standard operation, application rules are intended to be restricted to specific users or roles based on administrative sharing configurations. However, when an authenticated user initiates a request within the Reprocess Bank Statement Items feature, the application executes the requested operations without cross-referencing the user context against the access permissions of the targeted rule IDs. Consequently, any authenticated user can reference, invoke, and apply internal rules created by other users, effectively bypassing the designed authorization boundary and achieving vertical or horizontal privilege escalation within the transaction scope.\nThe attack flow proceeds as follows: First, an authenticated user establishes a standard session with the SAP S/4HANA application and navigates to the Reprocess Bank Statement Items interface. Second, the user crafts or intercepts a request targeting a specific rule identifier belonging to another user or administrative tier that has not been shared with them. Third, the user submits the request to the vulnerable function. Fourth, the application processes the input and executes the unshared rule without validating authorization. Finally, the system returns the processed output to the user, allowing unauthorized utilization of restricted application logic.\nThe requirements for successful exploitation include an active authenticated session within the SAP S/4HANA environment, network access to the application endpoints hosting the affected function, and the ability to identify or enumerate valid rule identifiers. The vulnerability does not allow for arbitrary code execution, system-level compromise, or direct data modification outside the operational constraints of the affected component, resulting in a low confidentiality impact and a complete lack of integrity and availability impact."
}