SAP Netweaver JAVA – Information Disclosure in DispatchServlet
Impact on Business
An unauthenticated attacker can retrieve a list of valid usernames from the affected SAP system. This information disclosure aids attackers in identifying valid accounts, which can be leveraged to facilitate further attacks such as brute-force attempts or social engineering campaigns, potentially compromising the system’s security.
Vulnerability Details
The DispatchServlet within the com.sap.nw.wpc.dispatcher.deploy application lacks proper authentication checks. This allows an unauthenticated remote attacker to query specific endpoints and retrieve sensitive information, specifically the enumeration of valid SAP usernames existing on the target system.
Solution
SAP has released SAP Note 3568307 which provides patched versions of the affected components.
The patches can be downloaded from https://me.sap.com/notes/3568307.
Onapsis strongly recommends SAP customers to download the related security fixes and apply them to the affected components in order to reduce business risks.
Report Timeline
- 12/06/2024: Onapsis reports vulnerability to SAP
- 04/08/2025: SAP issues the patch
References
Advisory Information
- Public Release Date: 07/30/2026
- Security Advisory ID: ONAPSIS-2026-0017
- Researcher(s): Adrian Radulescu
Vulnerability Information
- Vendor: SAP
- Affected Components: SAP NetWeaver Application Server for Java (Check SAP Note 3568307 for detailed information on affected releases)
- Vulnerability Class: Information Disclosure
- CVSS v3 score: 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N)
- Risk Level: Medium
- Assigned CVE: CVE-2025-26657
- Vendor patch Information: SAP Security NOTE 3568307
Affected Components Description
The vulnerability specifically affects the com.sap.nw.wpc.dispatcher.deploy application component within the SAP NetWeaver Application Server for Java environment.
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Onapsis Research Labs provides the industry analysis of key security issues that impact mission-critical systems and applications. Delivering frequent and timely security and compliance advisories with associated risk levels, Onapsis Research Labs combine in-depth knowledge and experience to deliver technical and business-context with sound security judgment to the broader information security community.
Find all reported vulnerabilities at: https://github.com/Onapsis/vulnerability_advisories
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