Description

IBM WebSphere Application Server 9.0, and 8.5 could allow a remote attacker to bypass authentication on an admin console servlet.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "6.4",
  "pubDate": "2026-09-14T20:16:39.500Z",
  "pubdate": "2026-09-14T20:16:39.500Z",
  "executiveSummary": "This vulnerability involves an authentication bypass flaw within the administrative console servlet of IBM WebSphere Application Server versions 9.0 and 8.5.\nThe vulnerability allows remote, unauthenticated attackers to circumvent established security controls and gain unauthorized access to administrative functions.\nThe primary risk entails full compromise of the application server management interface, potentially leading to unauthorized configuration changes, deployment of malicious artifacts, or total server takeover.\nExploitation does not require prior authentication, significantly lowering the barrier for entry for remote attackers.\nGiven the critical nature of the management console in centralized server administration, this vulnerability poses a severe threat to the confidentiality, integrity, and availability of the affected environments.",
  "technicalDetails": "The vulnerability resides within the request handling logic of the administrative console servlet in IBM WebSphere Application Server. It stems from a failure to correctly enforce authentication filters or validate session tokens during the request lifecycle for specific servlet endpoints.\nIn a secure configuration, the administrative console servlet expects a valid session ID or authentication header to grant access to protected management resources. The flaw enables an attacker to manipulate the request path or specific request parameters to bypass these security checks, effectively tricking the application into processing the request as if it originated from a privileged, authenticated user.\nThe attack flow typically involves a remote attacker crafting a specially formed HTTP request directed at the vulnerable admin console servlet. By leveraging inconsistencies in how the application container parses URL patterns or handles servlet mappings, the attacker avoids the invocation of the authentication provider associated with the console.\nOnce the authentication mechanism is bypassed, the attacker achieves unauthorized access to the administrative console. This interface provides extensive capabilities, including but not limited to, modifying server configurations, viewing sensitive environment variables, installing enterprise applications (WAR/EAR files), and executing arbitrary system commands through diagnostic or administrative features.\nThe vulnerable component is the administrative console servlet responsible for handling management traffic. Affected versions include IBM WebSphere Application Server 9.0 and 8.5. The impact of successful exploitation is critical, as it grants full administrative control over the application server process and the underlying OS context where the JVM is executing.\nPost-exploitation activities can lead to persistence through the installation of malicious administrative plugins, data exfiltration from the application server’s internal registry, or lateral movement within the corporate network by leveraging the server's trusted identity."
}