CVE-2026-16906 in IBM
Summary
by MITRE • 08/12/2026
IBM i 7.6, and 7.5 could allow a remote authenticated attacker to execute arbitrary commands with elevated privileges due to improper neutralization of special elements used in an OS command.
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Analysis
by VulDB Data Team • 08/12/2026
This vulnerability exists in IBM i operating systems version 7.6 and 7.5 where a remote authenticated attacker can exploit a command injection flaw to execute arbitrary code with elevated privileges. The core technical issue stems from insufficient input validation and sanitization within the system's command processing mechanisms, allowing maliciously crafted inputs to be interpreted as OS commands rather than data. When legitimate users authenticate and submit specially constructed payloads through vulnerable interfaces, the system fails to properly neutralize special characters that could alter the intended execution flow of operating system commands.
The vulnerability manifests as a command injection weakness that aligns with common CWE classifications such as CWE-78 and CWE-88, which address improper neutralization of special elements in OS commands. Attackers can leverage this flaw by crafting inputs that contain shell metacharacters, command separators, or other malicious constructs that bypass normal input validation checks. The authentication requirement means that only users with valid credentials can exploit this vulnerability, but the privilege escalation aspect allows them to execute commands with elevated system permissions. This creates a significant security risk where authorized users can potentially gain administrative access to critical system functions.
The operational impact of this vulnerability extends beyond simple command execution as it enables attackers to manipulate system configurations, access sensitive data, modify system files, and potentially establish persistent backdoors. The remote nature of the attack means that exploitation does not require physical access to the system, making it particularly dangerous for network-connected environments. Organizations using IBM i 7.6 or 7.5 are at risk of complete system compromise when this vulnerability is exploited, as the elevated privileges allow attackers to bypass standard security controls and access core system components.
Mitigation strategies should focus on implementing robust input validation mechanisms that properly sanitize all user inputs before processing them as commands. Organizations must apply official IBM security patches and updates immediately upon availability to address the root cause of the vulnerability. Network segmentation and access control measures can help limit exposure by restricting remote access to critical systems. Additionally, implementing principle of least privilege configurations ensures that even if exploitation occurs, attackers cannot leverage excessive privileges. Regular security audits and monitoring for anomalous command execution patterns should be implemented as part of ongoing defensive measures. The vulnerability demonstrates the importance of proper input handling in operating system interfaces and aligns with ATT&CK techniques related to command injection and privilege escalation.