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Java CVE-2026-12666

| EUVDEUVD-2026-78873 HIGH
Improper Restriction of XML External Entity Reference (CWE-611)
2026-09-15 ibm GHSA-8mq2-hm2c-3ccx
8.1
CVSS 3.1 · NVD
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Severity by source

Vendor (ibm) PRIMARY
HIGH
qualitative
NVD
8.1 HIGH
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Primary rating from Vendor (ibm).

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
High

Lifecycle Timeline

2
Analysis Generated
Sep 15, 2026 - 18:05 vuln.today
CVE Published
Sep 15, 2026 - 17:08 cve.org
HIGH 8.1

DescriptionNVD

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.

AnalysisAI

IBM MQ message queueing middleware fails to properly restrict XML external entity resolution while processing MQRFH2 message headers, letting an authenticated queue user read server-side files or resources and drive the broker and its Java clients into a denial-of-service state. Affected releases span the 9.1.x, 9.2.x, 9.3.x and 9.4.x LTS/CD streams plus 10.0.0.0 Classes for Java, so any environment running the JMS/XMS or Java messaging client against a current broker is in scope. …

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CVE-2026-12666 vulnerability details – vuln.today

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