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

Quick assessment

Affected
IBM MQ
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

IBM MQ 9.1.0.0 至 9.1.0.37 LTS、9.2.0.0 至 9.2.0.43 LTS、9.3.0.0 至 9.3.0.41 LTS、9.3.0.0 至 9.3.5.1 CD、9.4.0.0 至 9.4.0.25 LTS、9.4.0.0 至 9.4.5.1 CD 以及 10.0.0.0 的 Java 类（Classes for Java）可能允许已认证的攻击者利用 MQRFH2 头部处理过程中的 XML 外部实体注入漏洞，从而获取敏感信息或导致服务拒绝（DoS）。

CVSS 8.1 · High

Affected Version Matrix 7

VendorProduct Version RangeStatus
IBM MQ 9.1.0.0≤ 9.1.0.37 LTS affected
9.2.0.0≤ 9.2.0.43 LTS affected
9.3.0.0≤ 9.3.0.41 LTS affected
9.3.0.0≤ 9.3.5.1 CD affected
9.4.0.0≤ 9.4.0.25 LTS affected
9.4.0.0≤ 9.4.5.1 CD affected
10.0.0.0 affected
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I. Basic Information for CVE-2026-12666

Vulnerability Information
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Vulnerability Title
IBM MQ Java messaging is vulnerable to XML external entity injection
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
XML外部实体引用的不恰当限制(XXE)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
IBM MQ 9.1.0.0 ~ 9.1.0.37 LTS cpe:2.3:a:ibm:mq:9.1.0.0:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-12666

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III. Intelligence Information for CVE-2026-12666

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Other References for CVE-2026-12666 (1)

Same Patch Batch · IBM · 2026-09-15 · 25 CVEs total

CVE-2026-53710 10.0 CRITICAL MCP Context Forge: RestrictedPython sandbox bypass via getattr builtin in python_sandbox_s
CVE-2026-12351 9.8 CRITICAL IBM MQ is vulnerable to unauthenticated remote code execution via JNDI injection
CVE-2026-12728 8.8 HIGH IBM MQ Java messaging is vulnerable to remote code execution
CVE-2026-11729 8.5 HIGH IBM MQ Java messaging is vulnerable to remote code execution
CVE-2026-12355 8.1 HIGH IBM MQ Resource Adapter IVT servlet is vulnerable to unauthenticated remote code execution
CVE-2026-11728 8.1 HIGH IBM MQ .NET client is vulnerable to remote code execution
CVE-2026-12354 7.5 HIGH IBM MQ Resource Adapter IVT message-driven bean is vulnerable to remote code execution via
CVE-2026-12752 7.1 HIGH Multiple security vulnerabilities addressed with IBM Business Automation Workflow August 2
CVE-2026-12667 7.1 HIGH IBM MQ .NET client is vulnerable to XML external entity injection
CVE-2026-12150 7.0 HIGH IBM MQ queue manager is vulnerable to denial of service
CVE-2026-11864 6.5 MEDIUM Multiple security vulnerabilities are addressed with IBM Cloud Pak for Business Automation
CVE-2026-12750 6.4 MEDIUM Multiple security vulnerabilities are addressed with IBM Cloud Pak for Business Automation
CVE-2026-12749 6.4 MEDIUM Multiple security vulnerabilities are addressed with IBM Cloud Pak for Business Automation
CVE-2026-11918 5.4 MEDIUM IBM ContextForge MCP Gateway is affected by security filter bypass via nested payload stru
CVE-2026-12751 5.4 MEDIUM Multiple security vulnerabilities are addressed with IBM Cloud Pak for Business Automation
CVE-2026-12742 5.4 MEDIUM Multiple secuirty vulnerabilies addressed with IBM Business Automation Workflow August 202
CVE-2026-12358 Security vulnerabilities have been addressed in IBM Verify Identity Access and IBM Securit
CVE-2026-11921 Security vulnerabilities have been addressed in IBM Verify Identity Access and IBM Securit
CVE-2026-11928 Security vulnerabilities have been addressed in IBM Verify Identity Access and IBM Securit
CVE-2026-11926 Security vulnerabilities have been addressed in IBM Verify Identity Access and IBM Securit

Showing top 20 of 25 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: MQ
Same vendor: IBM
Same weakness: CWE-611

V. Comments for CVE-2026-12666

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