CVE-2026-16695 in i Access Client Solutions
Summary
by MITRE • 08/12/2026
IBM i Access Client Solutions 1.1.2.0 through 1.1.9.13 could allow a local attacker to execute arbitrary code 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 within IBM i Access Client Solutions versions 1.1.2.0 through 1.1.9.13, representing a critical security flaw that enables local attackers to execute arbitrary code on affected systems. The root cause stems from improper neutralization of special elements used in operating system commands, creating a command injection vulnerability that directly violates fundamental security principles. This issue falls under the CWE-78 category for OS Command Injection, which is classified as a high-risk vulnerability in the Common Weakness Enumeration catalog.
The technical implementation of this flaw occurs when the application processes user input or configuration data without proper sanitization before incorporating it into system commands. Attackers can exploit this weakness by crafting malicious inputs that contain special command characters such as semicolons, pipes, or other shell metacharacters that allow arbitrary command execution within the context of the running process. The vulnerability specifically affects local attackers who already have access to the system, though the privilege escalation potential remains significant given the nature of OS command injection.
From an operational impact perspective, this vulnerability compromises the integrity and confidentiality of systems running affected IBM i Access Client Solutions versions. Local attackers can leverage this flaw to execute malicious code with the privileges of the affected application, potentially leading to complete system compromise, data exfiltration, or further lateral movement within network environments. The attack surface is particularly concerning because it affects client-side applications that may be installed on desktop systems, workstations, or servers where users have legitimate access.
The exploitability of this vulnerability aligns with ATT&CK technique T1059.003 for Command and Scripting Interpreter: Windows Command Shell, demonstrating how command injection flaws can be leveraged to achieve persistent system compromise. Organizations should immediately implement mitigation strategies including updating to the latest supported versions of IBM i Access Client Solutions, implementing strict input validation controls, and applying least privilege access models to limit potential exploitation vectors.
Security professionals should monitor for indicators of compromise related to unauthorized command execution attempts and implement comprehensive logging mechanisms to detect anomalous system behavior. The vulnerability represents a significant risk to organizations that rely on IBM i Access Client Solutions for enterprise connectivity, particularly those with legacy systems where immediate patching may not be feasible. Regular security assessments and penetration testing should include verification of proper input sanitization practices within all application components.
Organizations must also consider implementing network segmentation controls and privilege management policies to limit the potential impact of successful exploitation attempts. The remediation process requires careful planning due to the critical nature of the IBM i Access Client Solutions applications in enterprise environments, with patch deployment typically requiring coordinated system maintenance windows to ensure business continuity while addressing the security vulnerability effectively.