CVE-2026-12354 in IBM
Summary
by MITRE • 09/15/2026
IBM MQ 9.1.0.0 through 9.1.0.37 LTS, 9.2.0.0 through 9.2.0.43 LTS, 9.3.0.0 through 9.3.0.41 LTS, 9.3.0.0 through 9.3.5.1 CD, 9.4.0.0 through 9.4.0.25 LTS, 9.4.0.0 through 9.4.5.1 CD, and 10.0.0.0 could allow an authenticated attacker to execute arbitrary code on the application server due to improper validation of JNDI names in the Resource Adapter Installation Verification Test application.
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Analysis
by VulDB Data Team • 09/15/2026
The vulnerability identified affects multiple versions of IBM MQ, specifically ranging from version 9.1.0.0 through 9.4.5.1 and including early builds of version 10.0.0.0. This security flaw resides within the Resource Adapter Installation Verification Test application component of the messaging middleware software. The core technical issue is classified as improper validation of Java Naming and Directory Interface, or JNDI, names. In enterprise environments utilizing IBM MQ for asynchronous message passing between distributed applications, this specific module serves a diagnostic purpose during installation to verify that the resource adapter has been correctly configured and integrated with the application server environment. However, the implementation fails to adequately sanitize or validate user-supplied input when processing these naming references, creating an opening for malicious actors who have already gained authenticated access to the system.
From a technical perspective, JNDI is a Java API that provides naming and directory functionality to applications written in the Java programming language. It allows clients to discover and look up data and objects via a name. The vulnerability exploits the fact that certain versions of the underlying Java runtime environment are susceptible to insecure deserialization when processing specific JNDI lookup requests, particularly those involving remote references such as RMI or LDAP protocols. When an authenticated attacker provides a crafted JNDI name pointing to a malicious server controlled by them, the vulnerable application component processes this request without sufficient checks on the protocol type or the trustworthiness of the target host. This leads to the loading and instantiation of arbitrary classes from the remote location during the deserialization process, effectively bypassing standard security controls that would otherwise prevent such code execution.
The operational impact of this vulnerability is severe due to its potential for Remote Code Execution on the application server hosting IBM MQ. Because the flaw requires authentication, it limits the attack surface to users who have valid credentials within the IBM MQ environment. However, in many enterprise deployments, service accounts or administrative interfaces may possess elevated privileges that allow interaction with these diagnostic tools. Once code execution is achieved, an attacker can run arbitrary commands on the host system with the same permissions as the application server process. This typically results in a complete compromise of the affected server, allowing for data exfiltration, lateral movement within the network, installation of persistent backdoors, or disruption of critical messaging services that other business applications rely upon.
This vulnerability aligns closely with Common Weakness Enumeration identifier CWE-502, which describes Deserialization of Untrusted Data. The exploitation technique maps directly to MITRE ATT&CK tactic T1059, specifically sub-technique T1059.007 for Command and Scripting Interpreter, as the ultimate goal is often to execute system commands via the compromised Java runtime environment. Furthermore, it relates to CWE-20 Improper Input Validation because the root cause lies in the failure to restrict or validate the input parameters passed to the JNDI lookup mechanism. The lack of strict allow-lists for protocols and hostnames enables the attacker to redirect the deserialization process toward external resources rather than local classes only.
Mitigation strategies must focus on immediate patching and configuration hardening. IBM has released updates that address this issue in all affected versions, so organizations should prioritize upgrading their IBM MQ installations to the latest fixed releases as soon as possible. For environments where immediate patching is not feasible due to operational constraints, network segmentation can provide a layer of defense by restricting outbound connections from the application server hosts to untrusted networks or specific IP addresses known to be malicious. Additionally, administrators should enforce strict least-privilege principles for service accounts used in IBM MQ configurations, ensuring that even if an attacker gains access through this vulnerability, their ability to impact critical infrastructure is limited. Enabling detailed audit logging and monitoring for unusual JNDI lookup patterns can also aid in early detection of exploitation attempts before full system compromise occurs.