CVE-2026-66764 in S4HANA
Summary
by MITRE • 08/11/2026
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
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Analysis
by VulDB Data Team • 08/11/2026
The vulnerability in SAP S/4HANA's bank statement item reprocessing functionality represents a critical authorization flaw that undermines the system's access control mechanisms. This issue stems from insufficient validation of user permissions during the reprocessing workflow, where authenticated users can bypass normal authorization restrictions to access and utilize processing rules that have not been explicitly shared with them. The flaw exists within the application's rule management system, specifically in how it handles rule visibility and execution permissions for bank statement items.
The technical implementation of this vulnerability allows unauthorized rule utilization through a privilege escalation vector that operates at the application level. When users initiate bank statement reprocessing operations, the system fails to verify whether the current user has proper authorization to execute specific rules, creating an access control gap that can be exploited by both malicious insiders and external attackers who have gained initial authenticated access. This weakness directly violates the principle of least privilege and demonstrates inadequate authorization enforcement within SAP's security framework.
The operational impact of this vulnerability extends beyond simple unauthorized rule usage, as it creates potential for data manipulation and financial transaction integrity issues within the banking processing environment. While the reported impact on confidentiality is classified as low, the ability to execute unshared rules could potentially allow attackers to modify bank statement processing behavior, leading to incorrect financial reporting or unauthorized transaction handling. The absence of impact on integrity and availability suggests that the flaw primarily affects authorization controls rather than system stability or data protection mechanisms.
Security professionals should consider this vulnerability in the context of SAP's authorization management practices and the broader landscape of privileged access management. This issue aligns with CWE-284 which addresses improper access control and represents a classic case of insufficient authorization checks within enterprise application environments. The vulnerability also intersects with ATT&CK technique T1078 which covers valid accounts and privilege escalation through unauthorized access to system resources.
Organizations should implement immediate mitigations including enhanced monitoring of rule usage patterns, implementation of stricter authorization controls for bank statement processing, and regular review of shared rule permissions. SAP customers should ensure they are running the latest security patches and consider implementing additional access controls outside of the standard SAP authorization framework. The vulnerability highlights the importance of comprehensive authorization testing and the need for continuous security assessment of business process automation features within enterprise resource planning systems.