The vulnerability CVE-2026-58240 describes a missing authentication check in SAP NetWeaver Message Server during the registration of internal application server components. An unauthenticated attacker could exploit this to register unauthorized components and perform unauthorized actions. However, SAP NetWeaver is a proprietary software, and its patches are distributed through SAP's support channels, not public code repositories. The provided reference URLs (SAP Notes and general SAP Security Patch Day information) do not contain specific code changes, commit details, or file paths that would allow for the identification of exact vulnerable functions. Public searches for the CVE also only reiterate the vulnerability description without providing technical patch details. Therefore, it is not possible to identify the precise function signatures, file paths, or patch evidence required to fulfill the request.