# CVE-2026-58240: SAP NetWeaver Message Server authentication bypass in component registration

Source: https://junglewise.ai/threats/cve-2026-58240-sap-netweaver-message-server-authentication-bypass-in-component  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-08. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-58240 · Severity: critical · CVSS 9.8 · Published 2026-09-08

SAP NetWeaver Message Server is a central communication hub used by SAP enterprise applications to route messages and manage server instances. This vulnerability allows an unauthenticated attacker with network access to register unauthorized application server components, potentially gaining control over system operations. An exploit could result in data breaches, system compromise, and service disruption across the entire SAP environment.

Technologies: [SAP NetWeaver](https://junglewise.ai/threats/technologies/netweaver). Vendors: [SAP](https://junglewise.ai/threats/vendors/sap).

## Quick answers

**Is CVE-2026-58240 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-58240 being exploited in the wild.

**How severe is CVE-2026-58240?** Critical severity, with a CVSS score of 9.8, published 8 September 2026.

**Which products and versions are affected?** SAP NetWeaver <unknown>.

**Is there a fix for CVE-2026-58240?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-58240 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-58240?** Check whether you run SAP NetWeaver at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is an authentication bypass in the component registration mechanism of SAP NetWeaver Message Server. The service does not sufficiently validate the authenticity of internal application server components during registration, allowing an unauthenticated attacker with network access to register malicious components without proper authorization. Once registered, an unauthorized component can perform arbitrary actions within the application environment with the privileges of a legitimate component. The attack requires only network connectivity to the Message Server; no prior authentication or user interaction is required. SAP released patches on 2026-09-08 as part of their Security Patch Day program.

## Affected products

- SAP NetWeaver <unknown>

## Timeline

- 2026-09-08: disclosed
- 2026-09-08: advisory: Published as part of SAP Security Patch Day

## References

- [https://me.sap.com/notes/3759472](https://me.sap.com/notes/3759472)
- [https://url.sap/sapsecuritypatchday](https://url.sap/sapsecuritypatchday)

## Related threats

- [SAP NetWeaver Application Server ABAP memory corruption denial of service](https://junglewise.ai/threats/cve-2026-76973-due-to-a-memory-corruption-vulnerability-in-application-server)
- [SAP NetWeaver ABAP RFC protocol memory corruption](https://junglewise.ai/threats/cve-2026-76966-due-to-improper-rfc-protocol-validation-in-the-sap-kernel-used-by)
- [SAP NetWeaver Internet Graphics Service input validation buffer overflow](https://junglewise.ai/threats/cve-2026-120008-sap-netweaver-internet-graphics-service-does-not-sufficiently)
- [SAP NetWeaver SSRF in ABAP HTTP component](https://junglewise.ai/threats/cve-2026-109811-an-internal-abap-http-component-in-sap-netweaver-and-abap)
- [SAP NetWeaver Internet Graphics Service input validation denial of service](https://junglewise.ai/threats/cve-2026-109807-sap-netweaver-internet-graphics-service-does-not-sufficiently)