CVE-2026-12356 is a vulnerability in IBM Mq
Published on November 4, 2026
IBM MQ Managed File Transfer is affected by an arbitrary code execution vulnerability
IBM MQ 9.2.0.0 through 9.2.0.44 LTS, 9.3.0.0 through 9.3.0.42 LTS, 9.4.0.0 through 9.4.0.26 LTS, 9.4.0.0 through 9.4.5.1 CD, and 10.0.0.0 through 10.0.0.5 LTS and CD could allow an authenticated user with command queue access to execute arbitrary code by injecting malicious arguments into Ant script commands.
Vulnerability Analysis
CVE-2026-12356 is exploitable with network access, and requires small amount of user privileges. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to be very high.
Weakness Type
What is an Injection Vulnerability?
The software constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component. Software has certain assumptions about what constitutes data and control respectively. It is the lack of verification of these assumptions for user-controlled input that leads to injection problems. Injection problems encompass a wide variety of issues -- all mitigated in very different ways and usually attempted in order to alter the control flow of the process. For this reason, the most effective way to discuss these weaknesses is to note the distinct features which classify them as injection weaknesses. The most important issue to note is that all injection problems share one thing in common -- i.e., they allow for the injection of control plane data into the user-controlled data plane. This means that the execution of the process may be altered by sending code in through legitimate data channels, using no other mechanism. While buffer overflows, and many other flaws, involve the use of some further issue to gain execution, injection problems need only for the data to be parsed. The most classic instantiations of this category of weakness are SQL injection and format string vulnerabilities.
CVE-2026-12356 has been classified to as an Injection vulnerability or weakness.
Products Associated with CVE-2026-12356
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Affected Versions
IBM MQ:- Version 9.2.0.0, <= 9.2.0.44 is affected.
- Version 9.3.0.0, <= 9.3.0.42 is affected.
- Version 9.4.0.0, <= 9.4.0.26 is affected.
- Version 9.4.0.0, <= 9.4.5.1 is affected.
- Version 10.0.0.0, <= 10.0.0.5 is affected.