CVE-2026-17133: IBM App Connect Enterprise RCE Vulnerability

CVE-2026-17133 Overview

CVE-2026-17133 is an OS command injection vulnerability affecting IBM App Connect Enterprise. The flaw stems from improper neutralization of special elements used in an operating system command [CWE-78]. A local attacker can leverage this weakness to execute arbitrary code on the host system with the privileges of the App Connect Enterprise process.

The vulnerability affects IBM App Connect Enterprise versions 13.0.1.0 through 13.0.8.0 and 12.0.1.0 through 12.0.12.27. Exploitation requires local access and user interaction, but successful attacks compromise confidentiality, integrity, and availability of the affected system.

Critical Impact
A local attacker with the ability to influence command inputs can execute arbitrary OS commands, resulting in full compromise of the App Connect Enterprise host.

Affected Products

IBM App Connect Enterprise 13.0.1.0 through 13.0.8.0
IBM App Connect Enterprise 12.0.1.0 through 12.0.12.27

Discovery Timeline

2026-09-14 - CVE-2026-17133 published to NVD
2026-09-16 - Last updated in NVD database

Technical Details for CVE-2026-17133

Vulnerability Analysis

CVE-2026-17133 is an OS command injection flaw in IBM App Connect Enterprise. The product fails to sanitize special characters before passing user-controlled input into an operating system command. An attacker who can influence the vulnerable input path can append or substitute shell metacharacters to alter the intended command.

Successful exploitation grants arbitrary code execution in the security context of the App Connect Enterprise process. Because App Connect Enterprise commonly runs with elevated service privileges, code executed through this flaw can access integration flows, credentials, and connected systems.

Root Cause

The vulnerability is classified as [CWE-78] Improper Neutralization of Special Elements used in an OS Command. IBM App Connect Enterprise constructs an OS command using externally influenced data without properly escaping or validating shell metacharacters such as ;, |, &, and backticks.

Attack Vector

The attack vector is local and requires user interaction. An attacker must have local access to a system running a vulnerable App Connect Enterprise instance and must induce a legitimate user to trigger the vulnerable code path. Once triggered, the crafted input flows into the OS command construction routine and executes attacker-controlled commands.

No verified public proof-of-concept code is available at this time. Refer to the IBM Support Page for authoritative technical details.

Detection Methods for CVE-2026-17133

Indicators of Compromise

Unexpected child processes spawned by IBM App Connect Enterprise runtime processes such as IntegrationServer or DataFlowEngine.
Shell interpreters (cmd.exe, /bin/sh, /bin/bash, powershell.exe) executing under the App Connect Enterprise service account.
Anomalous outbound network connections initiated by App Connect Enterprise processes to attacker infrastructure.
Modifications to integration server configuration files or deployment artifacts outside of change windows.

Detection Strategies

Monitor process lineage for App Connect Enterprise binaries spawning shells or interpreters.
Alert on command lines containing shell metacharacters passed to App Connect Enterprise integration endpoints.
Correlate authentication events with subsequent execution of unexpected system utilities under the App Connect service context.

Monitoring Recommendations

Enable audit logging for all App Connect Enterprise administrative and deployment actions.
Forward host process telemetry and command-line arguments to a centralized SIEM for behavioral analysis.
Baseline normal child processes for App Connect Enterprise services and alert on deviations.

How to Mitigate CVE-2026-17133

Immediate Actions Required

Inventory all IBM App Connect Enterprise installations and identify hosts running versions 12.0.1.0 through 12.0.12.27 or 13.0.1.0 through 13.0.8.0.
Apply the vendor-supplied fix referenced in IBM's security bulletin as soon as it is available in your environment.
Restrict local access to App Connect Enterprise hosts to authorized administrators only.
Review recent process execution logs on affected hosts for signs of prior exploitation.

Patch Information

IBM has published remediation guidance for CVE-2026-17133. Administrators should consult the IBM Support Page for the fixed versions, iFixes, and upgrade procedures applicable to the 12.0.x and 13.0.x branches.

Workarounds

Enforce least privilege for the service account running App Connect Enterprise to limit blast radius from arbitrary code execution.
Restrict interactive and remote login on App Connect Enterprise hosts using host-based access controls.
Implement application allowlisting to prevent unexpected shell interpreters from executing under the App Connect service context.
Segment App Connect Enterprise servers on isolated network zones to constrain lateral movement.

bash

# Configuration example: restrict shell execution for the App Connect service account (Linux)
# Replace 'mqsiuser' with the actual account used by your App Connect Enterprise deployment
usermod -s /usr/sbin/nologin mqsiuser
chmod 750 /opt/ibm/ace-13/server