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IBM EUVDEUVD-2026-78153

| CVE-2026-13285 HIGH
Improper Restriction of XML External Entity Reference (CWE-611)
2026-09-14 psirt@us.ibm.com GHSA-6fjc-9pf3-r46v
7.1
CVSS 3.1 · Vendor: us
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Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A02:2025 - Security Misconfiguration
ASVS 5.0
V13 - Configuration XML external entity prevention
MITRE ATT&CK

2 techniques across 2 tactics: Initial Access, Collection

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
No patch listed yet 0.4% exploitation probability (EPSS)

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AnalysisAIv1 – Sep 15, 2026

XML external entity (XXE) injection in IBM MQ (9.1, 9.2, 9.3, 9.4 LTS/CD lines and 10.0.0.0) lets a remote attacker who can already authenticate to MQ and get XML content parsed by the product cause the parser to resolve attacker-supplied external entities. Successful exploitation exposes sensitive information readable by the MQ process (high confidentiality impact) and can consume memory resources, degrading availability. CVSS 3.1 scores this 7.1 (AV:N/AC:L/PR:L/UI:N), so exploitation requires low-privileged authenticated access rather than being fully unauthenticated; no public exploit code or CISA KEV entry was present in the supplied intelligence at time of analysis.

Affected VersionsENISA

MQ 9.4.0.0 ≤9.4.5.1 CD
MQ 9.2.0.0 ≤9.2.0.43 LTS
MQ 9.1.0.0 ≤9.1.0.37 LTS
MQ 9.3.0.0 ≤9.3.5.1 CD
MQ 9.3.0.0 ≤9.3.0.41 LTS
MQ 10.0.0.0
MQ 9.4.0.0 ≤9.4.0.25 LTS

Affected Packages

euvd mq no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

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  • Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (us) PRIMARY 7.1 HIGH
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L

Primary rating from Vendor (us) · only source for this CVE.

CVSS VectorVendor: us

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

DescriptionCVE.org

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 is vulnerable to an XML external entity injection (XXE) attack when processing XML data. A remote attacker could exploit this vulnerability to expose sensitive information or consume memory resources.

Threat Intelligence Overview

EPSS Score
0.4%
Top 68% exploitable
Data Quality
5 sources
Confidence: Medium

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity HIGH
CISA KEV No
Public POC No
EPSS 0.4%
Patch available No
Active threat No
Deciding rule
HIGH severity (CVSS 7.0-8.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation
None
System Exposure· derived
Open
Automatable
No
Human Impact· derived
Medium
Technical Impact
Partial

Priority Score

36
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +36
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

XML External Entity (XXE) attacks exploit XML parsers that process Document Type Definitions (DTDs) without proper restrictions.

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