CVE-2026-58240: CWE-308: Use of Single-factor Authentication in SAP_SE SAP NetWeaver (Message Server)
Description
CVE-2026-58240 is a critical vulnerability in SAP NetWeaver Message Server versions 9.18, 9.19, and 9.20. The issue arises from insufficient validation of internal application server components during registration, allowing an unauthenticated attacker with network access to register unauthorized components. This can lead to unauthorized actions within the application environment, severely impacting confidentiality, integrity, and availability.
CVSS v3.1
Score 9.8critical
Affected software
SAP_SE
SAP NetWeaver (Message Server)
pkg:github/sap_se/SAP_NetWeaver_Message_ServerRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
SAP NetWeaver Message Server does not adequately verify the authenticity of internal application server components during their registration process. An attacker without any authentication but with network access to the affected service could exploit this weakness to register unauthorized components. This unauthorized registration could enable the attacker to perform actions within the application environment that compromise the system's confidentiality, integrity, and availability. The vulnerability is identified as CWE-308 (Use of Single-factor Authentication) and has a CVSS v3.1 score of 9.8, indicating a critical severity level.
Potential Impact
Successful exploitation allows an unauthenticated attacker to register unauthorized components within the SAP NetWeaver Message Server environment. This can lead to unauthorized actions that compromise the confidentiality, integrity, and availability of the affected system, representing a critical impact on the organization's security posture.
Mitigation Recommendations
No patch or official fix information is provided in the available data. Patch status is not yet confirmed — check the SAP vendor advisory for current remediation guidance. Until a fix is available, restrict network access to the SAP NetWeaver Message Server to trusted hosts only and monitor for unauthorized component registrations if possible.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- sap
- Date Reserved
- 2026-06-29T19:35:04.185Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a9f5c5bacd9273b49b3db47
Added to database: 09/08/2026, 00:52:43 UTC
Last enriched: 09/16/2026, 02:50:45 UTC
Last updated: 10/23/2026, 01:15:25 UTC
Views: 136
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