CVE-2026-12667
Received Received - Intake

IBM MQ XML External Entity Injection Vulnerability

Publication date: 2026-09-15

Last updated on: 2026-09-15

Assigner: IBM Corporation

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 could allow an authenticated attacker to read files from a vulnerable .NET client or cause limited denial of service due to improper handling of XML external entities in RFH2 folder parsing.

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Meta Information

Published
2026-09-15
Last Modified
2026-09-15
Generated
2026-09-15
AI Q&A
2026-09-15
EPSS Evaluated
N/A
NVD
CVE-2026-12667
EUVD
EUVD-2026-78872

Affected Vendors & Products

Showing 7 associated CPEs
Vendor Product Version / Range
ibm mq From 9.1.0.0 (inc) to 9.1.0.37 (inc)
ibm mq From 9.2.0.0 (inc) to 9.2.0.43 (inc)
ibm mq From 9.3.0.0 (inc) to 9.3.0.41 (inc)
ibm mq From 9.3.0.0 (inc) to 9.3.5.1 (inc)
ibm mq From 9.4.0.0 (inc) to 9.4.0.25 (inc)
ibm mq From 9.4.0.0 (inc) to 9.4.5.1 (inc)
ibm mq 10.0.0

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-611 The product processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output.

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Executive Summary

This is an XML External Entity (XXE) vulnerability in IBM MQ's .NET client's RFH2 message parser. An authenticated attacker could exploit improper XML entity handling to read files from a vulnerable system or cause limited denial of service.

Impact Analysis

An attacker could access sensitive files on systems running vulnerable IBM MQ versions or disrupt service availability. The impact requires authentication but could lead to data breaches or service disruptions.

Compliance Impact

This vulnerability could lead to unauthorized data access, potentially violating GDPR's data protection requirements or HIPAA's safeguards for protected health information. Organizations must remediate to maintain compliance.

Mitigation Strategies

Apply the specific cumulative security updates for your IBM MQ version as listed in the IBM advisory. If using versions 9.1.0.0 to 9.4.5.1, upgrade to IBM MQ version 10.0.0.5 or apply the relevant patch. No workarounds are available.

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