Arbitrary Code Execution Flaw in IBM MQ Products
CVE-2026-12356

7.5HIGH

Key Information:

Vendor

IBM
Status
MQ
Vendor
CVE Published:
4 November 2026

What is CVE-2026-12356?

An identified vulnerability in IBM MQ allows authenticated users with command queue access to exploit the system by injecting malicious arguments into Ant script commands. This flaw can lead to the execution of arbitrary code, posing a significant risk to system integrity and security. It is crucial for organizations using affected versions of IBM MQ to apply the security patches promptly to mitigate potential threats.

Affected Version(s)

MQ 9.2.0.0 <= 9.2.0.44

MQ 9.3.0.0 <= 9.3.0.42

MQ 9.4.0.0 <= 9.4.0.26

References

https://www.ibm.com/support/pages/node/7294642
vendor-advisorypatch

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.