IBM WebSphere Liberty 17.0.0.3-26.0.0.10 Info Disclosure via JMX REST Parser
CVE-2026-78636 Published on November 8, 2026
IBM WebSphere Application Server Liberty prior to 26.0.0.11 is affected by multiple vulnerabilities
IBM WebSphere Application Server Liberty 17.0.0.3 through 26.0.0.10 is affected by an information disclosure vulnerability due to unsafe class reflection in the JMX REST connector body parser.
Vulnerability Analysis
CVE-2026-78636 is exploitable with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality, a small impact on integrity and availability.
Weakness Type
What is a Reflection Injection Vulnerability?
The application uses external input with reflection to select which classes or code to use, but it does not sufficiently prevent the input from selecting improper classes or code. If the application uses external inputs to determine which class to instantiate or which method to invoke, then an attacker could supply values to select unexpected classes or methods. If this occurs, then the attacker could create control flow paths that were not intended by the developer. These paths could bypass authentication or access control checks, or otherwise cause the application to behave in an unexpected manner. This situation becomes a doomsday scenario if the attacker can upload files into a location that appears on the application's classpath (CWE-427) or add new entries to the application's classpath (CWE-426). Under either of these conditions, the attacker can use reflection to introduce new, malicious behavior into the application.
CVE-2026-78636 has been classified to as a Reflection Injection vulnerability or weakness.
Products Associated with CVE-2026-78636
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Affected Versions
IBM WebSphere Application Server - Liberty:- Version 17.0.0.3, <= 26.0.0.10 is affected.