CVE-2026-12666

IBM MQ Java messaging is vulnerable to XML external entity injection

State: Published
Severity: 8.1 High
Published: Sep 15, 2026
Updated: Sep 17, 2026
Reserved: Jun 18, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	8.1 High	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H	ibm

Weaknesses

CWE-611 Improper Restriction of XML External Entity Reference

Affected Products

Product	Versions
MQIBM	9.1.0.0 through 9.1.0.37 LTSAffected 9.2.0.0 through 9.2.0.43 LTSAffected 9.3.0.0 through 9.3.0.41 LTSAffected 9.3.0.0 through 9.3.5.1 CDAffected 9.4.0.0 through 9.4.0.25 LTSAffected 9.4.0.0 through 9.4.5.1 CDAffected 10.0.0.0Affected

References

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

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