SAP September 2026 Security Patch Day: 19 new Notes. Note 3747649 (CVSS 10.0) affects Extended Passport; Note 3759472 (CVSS 9.8) affects NetWeaver Message Server. Integration Suite, S/4HANA, SAPUI5, CAP, developer tools. Patch immediately. https://support.sap.com/en/my-support/knowledge-base/security-notes-news/september-2026.html