CVE-2026-14532 in WebSphere Application Server
Summary
by MITRE • 10/13/2026
IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.9 could allow a Reader-role attacker to obtain version information that causes an uncaught exception.
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Analysis
by VulDB Data Team • 10/13/2026
The vulnerability identified in IBM WebSphere Application Server Liberty versions ranging from 17.0.0.3 through 26.0.0.9 represents a significant flaw in the application server's handling of administrative requests, specifically those requiring only Reader-level privileges. This issue stems from an improper error handling mechanism within the core administration interface or associated management APIs that process version queries and system status checks. When a user authenticated with the Reader role attempts to retrieve specific version information or trigger certain diagnostic operations, the underlying code fails to properly validate inputs or handle edge cases in the response generation logic. This deficiency leads directly to an uncaught exception being thrown by the Java Virtual Machine during runtime execution. The root cause of this flaw aligns closely with CWE-248, which describes Unhandled Exception, as well as CWE-755, Improper Handling of Unexpected or Unusual Condition, indicating that the software does not anticipate or gracefully manage a scenario where specific data retrieval operations result in internal state inconsistencies or null pointer dereferences.
From an operational perspective, this vulnerability primarily facilitates Denial of Service (DoS) attacks against the WebSphere Liberty instance. Because the exception is uncaught and occurs during standard administrative processing, it typically results in the termination of the current thread handling the request. In many configurations, particularly those without robust failover or automatic restart mechanisms for individual threads, this can lead to a degradation of service availability. If the affected endpoint is frequently targeted by an attacker with Reader access, they can exhaust system resources such as memory and CPU cycles associated with exception stack trace generation and logging, potentially causing the entire application server process to crash or become unresponsive. This impacts the confidentiality, integrity, and especially the availability of the hosted applications, violating the core tenets of secure software design where even low-privileged users should not be able to disrupt service continuity.
The exploitation path for this vulnerability is relatively straightforward given the privilege level required. An attacker who has obtained Reader-role credentials through phishing, credential stuffing, or other means can interact with the administrative console or REST APIs exposed by WebSphere Liberty. By crafting specific requests that trigger the flawed code path responsible for version information retrieval, the attacker induces the uncaught exception. This activity maps to MITRE ATT&CK technique T1499, Endpoint Denial of Service, specifically under sub-techniques involving resource exhaustion via application layer attacks. Furthermore, because it involves interacting with administrative interfaces, it also touches upon reconnaissance activities where an attacker might use repeated failures or error messages to fingerprint the exact version and build number of the server, although the primary impact here is service disruption rather than information disclosure per se.
Mitigation strategies for this vulnerability focus on both immediate remediation and long-term architectural improvements. The most effective solution is to apply the latest cumulative fix provided by IBM for WebSphere Application Server Liberty, which addresses the underlying code defect in exception handling logic. Organizations should prioritize patching all instances running versions between 17.0.0.3 and 26.0.0.9 that are exposed to networks where users with Reader privileges exist. In addition to patching, implementing strict access control policies is critical; administrators should ensure that the principle of least privilege is enforced by removing unnecessary Reader-level access from non-essential personnel or service accounts. Network segmentation can also help mitigate risk by restricting access to administrative interfaces only through trusted management networks and securing them with additional authentication layers such as multi-factor authentication, thereby reducing the attack surface available to potential adversaries seeking to exploit this flaw for denial of service purposes.