CVE-2026-14512 in WebSphere Application Server
Summary
by MITRE • 07/28/2026
IBM WebSphere Application Server 9.0, and 8.5 traditional is vulnerable to pre-authentication unsafe deserialization which could allow a remote attacker to bypass authentication or execute arbitrary code.
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Analysis
by VulDB Data Team • 07/28/2026
IBM WebSphere Application Server versions 9.0 and 8.5 traditional contain a critical pre-authentication unsafe deserialization vulnerability that represents a significant security risk for organizations relying on these application servers. This flaw allows remote attackers to exploit the deserialization process without requiring prior authentication credentials, effectively bypassing the server's authentication mechanisms entirely. The vulnerability stems from the server's improper handling of serialized objects during the deserialization phase, creating an attack surface where maliciously crafted input can trigger arbitrary code execution on the target system.
The technical nature of this vulnerability aligns with CWE-502, which specifically addresses unsafe deserialization in software systems. Attackers can leverage this weakness by crafting specially formatted serialized data that, when processed by the WebSphere server, executes unintended operations within the application context. The pre-authentication aspect means that the attack vector does not require valid user credentials or session tokens, making it particularly dangerous as it allows for initial access without detection. This vulnerability can be exploited through various attack vectors including HTTP requests, SOAP messages, or any interface that accepts serialized data input.
The operational impact of this vulnerability extends beyond simple code execution to encompass complete system compromise and potential data breaches. Successful exploitation could enable attackers to gain full administrative control over the WebSphere server, allowing them to modify application configurations, extract sensitive data, establish persistent backdoors, or launch further attacks against internal network resources. Organizations running these affected versions face significant risk as the vulnerability can be exploited from outside their network boundaries, making it an attractive target for external threat actors seeking to infiltrate enterprise environments.
Security practitioners should implement immediate mitigations including applying the latest IBM security patches and hotfixes specifically designed to address this deserialization vulnerability. Network segmentation and firewall rules should be configured to restrict access to WebSphere application server ports from untrusted networks, while monitoring systems should be enhanced to detect suspicious deserialization patterns in network traffic. Additionally, organizations should consider implementing input validation controls and disabling unnecessary deserialization functionality where possible. The remediation approach should align with ATT&CK framework techniques T1203 and T1059 which address process injection and command execution, as these are common exploitation methods for unsafe deserialization vulnerabilities. Regular security assessments and vulnerability scanning should be conducted to ensure that no other similar weaknesses exist within the WebSphere server configuration or associated applications.