CVE-2026-76967 in NetWeaver Business Client
Summary
by MITRE • 09/08/2026
SAP NetWeaver Business Client does not perform sufficient validation when processing certain locally stored data during application startup. An attacker with low privileges on the local system could replace this data with specially crafted content. When the application is next launched, the crafted content is processed and could lead to arbitrary code execution in the context of the user. This results in a high impact on confidentiality, integrity and availability of the application.
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Analysis
by VulDB Data Team • 09/08/2026
The vulnerability identified within SAP NetWeaver Business Client represents a critical failure in input validation mechanisms during the initialization phase of the application. Specifically, the software fails to adequately sanitize or verify locally stored data files that are loaded when the client starts up. This flaw allows an attacker who has achieved low-privilege access on the local system to manipulate these configuration or state files. By replacing legitimate data with specially crafted content, the attacker can exploit this lack of validation to execute arbitrary code within the security context of the currently logged-in user. The severity of this issue is compounded by its potential impact on confidentiality, integrity, and availability, as successful exploitation grants the adversary full control over the application environment without requiring elevated system privileges or network access.
From a technical perspective, this vulnerability aligns with CWE-94 Improper Control of Generation of Code (Code Injection) and CWE-50 Insufficient Verification of Data Authenticity. The root cause lies in the application's trust model regarding local files. Typically, applications assume that data stored on the local disk is safe because it was written by a previous instance of the same trusted process or an administrator. However, this assumption fails when the underlying operating system allows any user with write permissions to modify those specific directories or files. When SAP NetWeaver Business Client reads these untrusted inputs during startup without performing rigorous structural checks, type validation, or signature verification, it inadvertently processes malicious payloads as legitimate instructions or data structures. This leads to memory corruption or logic errors that the attacker can leverage to inject and execute shellcode or other executable artifacts.
The operational impact of this vulnerability is significant due to its low barrier for entry. An attacker does not need complex remote exploitation techniques or sophisticated social engineering campaigns beyond gaining basic access to a workstation, such as through phishing emails leading to malware installation or physical access. Once the crafted data is in place, execution occurs automatically upon the next launch of the application, making detection difficult without active monitoring. The consequence is a complete compromise of the user's session. This includes the potential exfiltration of sensitive business data stored within the client interface, modification of critical configurations leading to integrity loss, and disruption of services if the malicious code causes system instability or crashes. In enterprise environments where SAP systems are central to operations, this can lead to substantial financial and reputational damage.
Mitigation strategies must focus on both technical controls and administrative policies. First, users should be restricted from having write access to the installation directories or specific configuration folders used by SAP NetWeaver Business Client through strict file system permissions. Implementing Least Privilege principles ensures that even if an attacker compromises a user account, they cannot easily modify application files. Second, organizations should apply vendor-provided patches as soon as they become available, as these updates typically include enhanced input validation routines and stricter security checks for local data processing. Additionally, deploying endpoint detection and response solutions can help identify anomalous file modifications in critical directories or unusual process executions during application startup. Regular auditing of user privileges and monitoring for unauthorized changes to system files are essential components of a defense-in-depth strategy against this type of vulnerability.