CVE-2026-89103

Summary

SAP Gateway incorrectly activates a default Access Control List (ACL) with overly permissive privileges, misclassifying external attackers as trusted internal application servers. This allows unauthenticated remote attackers to bypass authentication and perform unauthorized actions within the SAP environment.

Exploitability

Exploitation is trivial for an unauthenticated attacker with network access to the SAP Gateway endpoint; no user interaction or prior access is required.

Blast radius

Successful exploitation could lead to full system compromise, including data exfiltration, unauthorized modifications, and service disruption across the entire SAP landscape due to the CVSS 10.0 severity and lack of authentication requirements.

Detection

Defenders should monitor SAP Gateway logs for unauthenticated requests to /sap/iwa/ntlm endpoints or anomalous internal-service-level API calls from external IP ranges; look for HTTP 200 responses to OData requests originating without valid authentication headers from known external sources.

Prioritized remediation

Apply SAP Security Note 3284785 or upgrade to SAP Gateway version 2.590 SP04 or later; until then, disable the default ACL by applying the mitigation described in SAP Note 3284785 to restrict access to trusted sources only.

Analysis generated locally by garnet-coder (no data left the box). AI-assisted — verify against primary sources before acting.