XML External Entity Injection Vulnerability in IBM MQ Products
CVE-2026-12666

8.1HIGH

Key Information:

Vendor

IBM
Status
MQ
Vendor
CVE Published:
15 September 2026

What is CVE-2026-12666?

A vulnerability exists in the IBM MQ products that enables an authenticated attacker to exploit XML external entity injection through improper processing of the MQRFH2 header. This flaw can potentially lead to unauthorized access to sensitive information or result in denial of service, highlighting the importance of secure XML handling practices and prompt system updates.

Affected Version(s)

MQ 9.1.0.0 <= 9.1.0.37 LTS

MQ 9.2.0.0 <= 9.2.0.43 LTS

MQ 9.3.0.0 <= 9.3.0.41 LTS

References

https://www.ibm.com/support/pages/node/7284939
vendor-advisorypatch

CVSS V3.1

Score:
8.1
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.