CVE-2026-13285 in IBM
Summary
by MITRE • 09/15/2026
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.
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Analysis
by VulDB Data Team • 09/15/2026
The identified vulnerability in IBM MQ versions ranging from 9.1.0.0 through 10.0.0.0 represents a critical security flaw rooted in the improper handling of XML data by the message queueing middleware. This weakness is classified as an XML External Entity injection, commonly referred to as XXE, which falls under the CWE-611 category within the Common Weakness Enumeration standard. The vulnerability arises because the application processes user-supplied or externally received XML documents without adequately sanitizing external entity references or disabling unnecessary XML features such as DTD processing. In a typical enterprise environment, IBM MQ serves as a central hub for asynchronous message passing between distributed applications, making it a high-value target for attackers seeking to disrupt operations or exfiltrate data from the internal network infrastructure.
From a technical perspective, the flaw allows an unauthenticated remote attacker to craft malicious XML payloads containing external entity declarations that reference local files on the server hosting the IBM MQ instance. By leveraging these entities during the parsing process, the attacker can force the application to read arbitrary files such as configuration files, password stores, or source code, thereby exposing sensitive information stored within the system's file system. This capability effectively bypasses standard access controls because the XML parser executes with the privileges of the IBM MQ service account, granting the attacker elevated permissions relative to their initial unauthenticated state. The exploitation does not require complex interaction patterns and can often be triggered through a single HTTP request or message submission depending on the specific integration point exploited within the MQ architecture.
The operational impact of this vulnerability extends beyond simple data disclosure. While information leakage is the primary concern, the attacker may also utilize XXE techniques to perform server-side request forgery, directing the vulnerable system to make requests to internal services that are not directly accessible from the external network. This can lead to further lateral movement within the organization's infrastructure. Additionally, certain variations of XXE attacks allow for denial-of-service conditions by triggering resource-intensive parsing operations or infinite loops through entity expansion, commonly known as billion laughs attacks. These actions consume significant memory and CPU resources on the IBM MQ server, potentially causing service degradation or complete unavailability for legitimate users relying on the message queueing platform for business-critical transactions.
Mitigation strategies must focus on immediate patching and configuration hardening. The most effective remediation is to upgrade IBM MQ to a version where this vulnerability has been addressed by the vendor, specifically targeting releases beyond 9.1.0.37 LTS, 9.2.0.43 LTS, 9.3.0.41 LTS, 9.3.5.1 CD, 9.4.0.25 LTS, and 9.4.5.1 CD, or version 10.0.0.0 and later where applicable. In scenarios where immediate patching is not feasible due to operational constraints, administrators should implement network-level controls such as firewall rules to restrict access to the MQ administration ports from untrusted networks. Furthermore, application developers integrating with IBM MQ must ensure that any XML processing components used in conjunction with the queue are configured to disable DTDs and external entities entirely. This aligns with security best practices outlined by OWASP for preventing XXE attacks. Continuous monitoring of system logs for unusual parsing errors or high resource utilization can also aid in early detection of exploitation attempts, providing a defense-in-depth approach alongside technical fixes.