CVE-2026-0507: SAP ABAP & NetWeaver RFCSDK RCE Vulnerability

CVE-2026-0507 Overview

CVE-2026-0507 is an OS Command Injection vulnerability affecting SAP Application Server for ABAP and SAP NetWeaver RFCSDK. This vulnerability allows an authenticated attacker with administrative access and adjacent network access to upload specially crafted content to the server. When this content is processed by the application, it enables the execution of arbitrary operating system commands, potentially leading to full compromise of the system's confidentiality, integrity, and availability.

Critical Impact

Successful exploitation of this command injection vulnerability could allow attackers to execute arbitrary operating system commands, resulting in complete system compromise including data theft, system manipulation, and service disruption.

Affected Products

• SAP Application Server for ABAP
• SAP NetWeaver RFCSDK
• SAP systems utilizing RFC (Remote Function Call) functionality

Discovery Timeline

• 2026-01-13 - CVE-2026-0507 published to NVD
• 2026-01-13 - Last updated in NVD database

Technical Details for CVE-2026-0507

Vulnerability Analysis

This vulnerability is classified as CWE-78 (Improper Neutralization of Special Elements used in an OS Command), commonly known as OS Command Injection. The flaw exists within the SAP Application Server for ABAP and SAP NetWeaver RFCSDK components, where user-supplied input is not properly sanitized before being passed to operating system command execution functions.

The attack requires an authenticated attacker with administrative privileges operating from an adjacent network. While these prerequisites reduce the attack surface, the potential impact is severe—successful exploitation grants the attacker the ability to execute arbitrary commands with the privileges of the SAP application, potentially leading to complete system takeover.

The changed scope indicator in the vulnerability assessment means that exploitation can affect resources beyond the vulnerable component's security scope, potentially impacting other systems or services hosted on the same infrastructure.

Root Cause

The root cause of CVE-2026-0507 is insufficient input validation and sanitization in the file upload and processing functionality of SAP Application Server for ABAP and SAP NetWeaver RFCSDK. When specially crafted content is uploaded and subsequently processed by the application, command separators or shell metacharacters embedded in the content are not properly neutralized, allowing them to be interpreted as OS commands.

This type of vulnerability typically occurs when:

• User-controlled input is concatenated directly into system command strings
• Shell metacharacters such as ;, |, &, $(), or backticks are not escaped or filtered
• The application relies on blocklist-based filtering that can be bypassed

Attack Vector

The attack requires adjacent network access, meaning the attacker must be on the same network segment or have local network access to the target SAP system. Combined with the requirement for administrative authentication, the attack scenario involves either:

1. A compromised administrative account being leveraged for exploitation
2. An insider threat with legitimate administrative access
3. An attacker who has gained adjacent network access and obtained administrative credentials through other means

The attacker uploads malicious content containing embedded OS commands through the vulnerable upload functionality. When the SAP application processes this content, the injected commands are executed at the operating system level with the privileges of the SAP service account.

Due to the nature of this vulnerability involving malicious file uploads and command injection, specific technical exploitation details are not provided here. Organizations should refer to the SAP Knowledge Base Article 3675151 for comprehensive technical information and remediation guidance.

Detection Methods for CVE-2026-0507

Indicators of Compromise

• Unusual file uploads to SAP Application Server directories, particularly files with unexpected extensions or embedded special characters
• Anomalous process spawning from SAP application processes, such as cmd.exe, /bin/sh, or /bin/bash
• Unexpected outbound network connections originating from the SAP server
• Modified system files or new files created in system directories by SAP processes
• Administrative account activity from unusual network locations or at unusual times

Detection Strategies

• Implement file integrity monitoring on SAP Application Server directories to detect unauthorized modifications or suspicious uploads
• Monitor process creation events for child processes spawned by SAP application processes, particularly command interpreters
• Review SAP security audit logs (SM21, ST22) for unusual administrative activities or application errors
• Deploy network-based intrusion detection rules to identify command injection patterns in RFC traffic
• Correlate authentication events with file upload activities to identify suspicious patterns

Monitoring Recommendations

• Enable comprehensive SAP security audit logging and forward logs to a SIEM for centralized analysis
• Configure alerts for administrative login events from adjacent network segments
• Monitor for process execution anomalies on SAP servers using endpoint detection and response (EDR) solutions
• Implement network segmentation monitoring to detect unauthorized lateral movement attempts
• Regularly review SAP transaction logs for unusual RFC call patterns

How to Mitigate CVE-2026-0507

Immediate Actions Required

• Apply the security patch referenced in SAP Note 3675151 as soon as possible
• Review and audit administrative accounts with access to the affected SAP components
• Implement network segmentation to restrict adjacent network access to SAP systems
• Enable enhanced logging on affected SAP systems to detect potential exploitation attempts
• Conduct a review of recent administrative activities and file uploads for signs of compromise

Patch Information

SAP has released a security patch addressing this vulnerability as part of their Security Patch Day. The fix is documented in SAP Knowledge Base Article 3675151. Organizations should obtain and apply this patch through the SAP Support Portal. Additional details about SAP's monthly security updates can be found on the SAP Security Patch Day page.

Before applying the patch, organizations should:

1. Review the SAP Note for any prerequisites or dependencies
2. Test the patch in a non-production environment
3. Plan the deployment during a maintenance window
4. Verify system functionality after patch application

Workarounds

• Restrict administrative access to SAP systems to only essential personnel with verified business requirements
• Implement strict network access controls limiting adjacent network connectivity to SAP servers
• Deploy application-layer firewalls or web application firewalls (WAF) to filter malicious upload attempts
• Consider temporarily disabling vulnerable upload functionality if business operations permit
• Implement additional authentication factors for administrative accounts accessing affected components

Organizations should apply the official patch as workarounds provide only temporary risk reduction and do not fully address the underlying vulnerability. Contact SAP Support for guidance on implementing appropriate compensating controls for your specific environment.