CVE-2026-76962: SAP S/4HANA Authorization Bypass Vulnerability

CVE-2026-76962 Overview

CVE-2026-76962 is a missing authorization vulnerability [CWE-862] in the SAP S/4HANA Manage Bank Chains application. The affected functionality does not enforce sufficient authorization checks before processing deletion requests. An authenticated attacker holding low-privilege credentials can send crafted requests to remove specific entries that should be outside their permitted scope. Successful exploitation impacts availability by deleting records that legitimate users depend on. Confidentiality and integrity remain unaffected. SAP addressed the issue through Security Note #3657599, released during the SAP Security Patch Day cycle.

Critical Impact
A low-privileged, network-authenticated attacker can delete bank chain entries in SAP S/4HANA that they should not be permitted to modify, causing localized availability loss in financial master data.

Affected Products

SAP S/4HANA
SAP S/4HANA Manage Bank Chains application component
Specific fixed versions are enumerated in SAP Security Note #3657599

Discovery Timeline

2026-09-08 - CVE-2026-76962 published to the National Vulnerability Database (NVD)
2026-09-08 - SAP publishes Security Note #3657599 on SAP Security Patch Day
2026-09-08 - Last updated in NVD database

Technical Details for CVE-2026-76962

Vulnerability Analysis

The Manage Bank Chains application in SAP S/4HANA exposes functionality for maintaining bank chain records used in payment routing. The affected code path processes delete operations without validating whether the calling user is authorized for the target entry. Attackers with any authenticated session and low privileges can invoke the delete function against entries owned by other users or scoped to other organizational units. Because the impact is limited to deletion of specific entries, the vulnerability affects availability only, without exposing or altering data content.

Root Cause

The root cause is a missing authorization check [CWE-862] on a delete handler within the Manage Bank Chains app. The application relies on the presence of an authenticated session and a general application role, but does not evaluate whether the authenticated principal has object-level permission for the specific bank chain entry targeted by the request.

Attack Vector

Exploitation requires network access to the SAP S/4HANA Fiori application and valid credentials with low privileges. The attacker interacts with the Manage Bank Chains app or issues equivalent OData requests directly to the backend service. By supplying the identifier of a bank chain entry outside their authorization scope, the attacker triggers the unprotected delete path and removes the record. No user interaction is required, and the attack complexity is low.

No public proof-of-concept exploit code is available. See SAP Security Note #3657599 for vendor technical details.

Detection Methods for CVE-2026-76962

Indicators of Compromise

Unexpected DELETE operations against bank chain OData entity sets in SAP Gateway logs
Bank chain master data entries missing without a corresponding change document authored by an authorized maintainer
Application logs showing delete calls from user IDs that do not typically maintain bank master data

Detection Strategies

Enable and review SAP Security Audit Log (SM19/SM20) events for authorization failures and successful delete actions on bank chain objects
Correlate Fiori launchpad access records with backend OData DELETE requests targeting the Manage Bank Chains service
Baseline which user IDs legitimately maintain bank chain data and alert on deletions originating from any other account

Monitoring Recommendations

Forward SAP Gateway, Security Audit Log, and change document (CDHDR/CDPOS) events into a centralized SIEM for correlation
Alert on high rates of delete operations against financial master data tables within a short time window
Track privilege assignments to the Manage Bank Chains app and flag new grants to users outside the finance function

How to Mitigate CVE-2026-76962

Immediate Actions Required

Apply the SAP-provided fix documented in SAP Security Note #3657599 to all affected SAP S/4HANA systems
Review and restrict role assignments that grant access to the Manage Bank Chains application to only the personnel who require it
Audit recent deletions of bank chain entries and restore any records removed without a legitimate business justification

Patch Information

SAP released the patch on Security Patch Day. Refer to SAP Security Note #3657599 for the list of affected Software Component versions and the corresponding support package or correction instructions. Additional context on the release cycle is available on the SAP Security Patch Day Announcement page.

Workarounds

If patching must be deferred, remove the Manage Bank Chains Fiori tile and underlying OData service authorizations from all non-essential users
Restrict network access to the SAP Gateway service endpoint that hosts the bank chains OData service to trusted administrative segments
Increase audit logging on bank master data objects and require a documented change ticket for every deletion until the patch is applied

bash

# Example: disable the affected OData service in transaction /IWFND/MAINT_SERVICE
# Navigate to /IWFND/MAINT_SERVICE and set the service status to inactive
# for the Manage Bank Chains service until SAP Note #3657599 is applied.