CVE-2026-12666
IBM MQ Java messaging is vulnerable to XML external entity injection
CVSS Score
8.1
EPSS Score
0.0%
EPSS Percentile
0th
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 Classes for Java could allow an authenticated attacker to obtain sensitive information or cause a denial of service due to XML external entity injection in MQRFH2 header processing.
| CWE | CWE-611 |
| Vendor | ibm |
| Product | mq |
| Published | Sep 15, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
High
Affected Versions
IBM / MQ
9.1.0.0 ≤ 9.1.0.37 LTS 9.2.0.0 ≤ 9.2.0.43 LTS 9.3.0.0 ≤ 9.3.0.41 LTS 9.3.0.0 ≤ 9.3.5.1 CD 9.4.0.0 ≤ 9.4.0.25 LTS 9.4.0.0 ≤ 9.4.5.1 CD 10.0.0.0