CVE-2026-12666

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...

CVE-2026-12666

IBM MQ Classes for Java is vulnerable to XML external entity (XXE) injection in the MQRFH2 header parser (CWE-611). An authenticated attacker can exploit this to obtain sensitive information (high confidentiality impact) or cause a denial of service (high availability impact). The CVSS 3.1 base s...

CVE-2026-12666 IBM MQ Java messaging is vulnerable to XML external entity injection

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...

EUVD-2026-78873

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...

CVE-2026-12666 IBM MQ Java messaging is vulnerable to XML external entity injection

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...

PT-2026-92155

Name of the Vulnerable Software and Affected Versions IBM MQ versions 9.1.0.0 through 9.1.0.37 LTS IBM MQ versions 9.2.0.0 through 9.2.0.43 LTS IBM MQ versions 9.3.0.0 through 9.3.0.41 LTS IBM MQ versions 9.3.0.0 through 9.3.5.1 CD IBM MQ versions 9.4.0.0 through 9.4.0.25 LTS IBM MQ versions...

CVE-2026-12666: Improper Restriction of XML External Entity Reference

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...

Security Bulletin: IBM MQ Appliance is affected by an XML external entity injection vulnerability (CVE-2026-12666)

Summary IBM MQ Appliance has addressed an XML external entity injection vulnerability that could allow an authenticated attacker to obtain sensitive information or cause a denial of service when processing MQRFH2 headers. Vulnerability Details CVEID:CVE-2026-12666 DESCRIPTION: IBM MQ Classes for...