CVE-2026-58240: Missing Authentication check in SAP NetWeaver (Message Server)
SAP NetWeaver Message Server does not sufficiently validate the authenticity of internal application server components during registration. An unauthenticated attacker with network access to the affected service could exploit this weakness to register an unauthorized component and potentially perform unauthorized actions within the application environment, resulting in a high impact on the confidentiality, integrity, and availability of the affected system.
Affected Software
Event History
Frequently Asked Questions
Who is exposed to exploitation?
SAP NetWeaver Message Server deployments are exposed if an attacker has network access to the affected service. No attacker authentication or user interaction is required.
What does an attacker need to do to exploit the issue?
The attacker needs network access to the Message Server service and can attempt to register an unauthorized application server component. The weakness is in insufficient validation of component authenticity during registration.
What impact could successful exploitation have?
An attacker may be able to perform unauthorized actions within the application environment. The reported impact is high for confidentiality, integrity, and availability.
What should be reviewed while remediation is pending?
Review which networks and systems can reach the affected Message Server service, because network access is the stated exploitation prerequisite. Also investigate component registrations for unauthorized application server components.