CVE-2026-0506 in NetWeaver Application Server ABAP and ABAP Platform
Summary
by MITRE • 01/13/2026
Due to a Missing Authorization Check vulnerability in Application Server ABAP and ABAP Platform, an authenticated attacker could misuse an RFC function to execute form routines (FORMs) in the ABAP system. Successful exploitation could allow the attacker to write or modify data accessible via FORMs and invoke system functionality exposed via FORMs, resulting in a high impact on integrity and availability, while confidentiality remains unaffected.
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Analysis
by VulDB Data Team • 01/13/2026
The vulnerability identified as CVE-2026-0506 represents a critical authorization flaw within the Application Server ABAP and ABAP Platform components of SAP systems. This missing authorization check creates a pathway for authenticated attackers to exploit RFC (Remote Function Call) functions that are intended to be restricted. The flaw specifically targets the execution of form routines within the ABAP environment, which are typically protected mechanisms designed to control access to sensitive system functionalities. The vulnerability exists at the application level where proper access controls fail to validate whether an authenticated user possesses the necessary privileges to execute specific form routines. This authorization bypass allows malicious actors who have already gained authentication access to the system to escalate their privileges and manipulate system resources beyond their intended scope.
The technical implementation of this vulnerability stems from insufficient validation of user permissions when executing RFC functions that interface with ABAP form routines. When an authenticated user invokes an RFC function that should require specific authorization levels to execute certain form routines, the system fails to verify whether the requesting user has adequate privileges. This gap in authorization checking creates an opportunity for attackers to leverage legitimate system functions to perform unauthorized operations. The form routines in question typically contain business logic and system integration code that can manipulate data, invoke system calls, and potentially access sensitive system resources. The flaw manifests when the system processes these RFC calls without proper authorization verification, allowing the execution of code that should be restricted to privileged users only. This architectural weakness aligns with CWE-284, which describes improper access control vulnerabilities where systems fail to properly enforce access restrictions.
The operational impact of this vulnerability extends beyond simple data manipulation to encompass significant risks to system integrity and availability. Attackers who successfully exploit this vulnerability can modify data accessible through form routines, potentially corrupting critical business information and disrupting normal system operations. The ability to invoke system functionality exposed via form routines means that attackers can execute various system-level operations that were not intended for general access. This includes potential modifications to system parameters, access to restricted data sets, and execution of administrative functions that could compromise the entire system. The high impact on integrity and availability stems from the fact that form routines often contain critical business logic and data manipulation functions that, when misused, can cause substantial damage to system operations and data consistency. The confidentiality of the system remains unaffected because the vulnerability does not enable unauthorized data disclosure, but the integrity and availability aspects pose severe operational risks.
Organizations affected by this vulnerability should implement immediate mitigations to address the authorization gap in their SAP systems. The primary recommendation involves strengthening access controls and ensuring that all RFC functions properly validate user permissions before executing form routines. This includes implementing proper authorization checks at the RFC function level and ensuring that form routines are only executable by users with appropriate system privileges. Security teams should conduct comprehensive access control reviews to identify and remediate similar authorization gaps across their SAP landscapes. Additionally, organizations should implement monitoring solutions that can detect unusual patterns of RFC function calls that might indicate exploitation attempts. The mitigation strategy should also include regular privilege reviews and ensuring that users only have access to the minimum necessary functions required for their operational roles. This vulnerability demonstrates the importance of maintaining robust authorization controls within complex enterprise systems and aligns with ATT&CK technique T1078 which covers valid accounts and privilege escalation tactics. Organizations should also consider implementing network segmentation and additional monitoring controls to detect potential exploitation attempts and limit the scope of potential damage from such authorization bypass vulnerabilities.