Deserialization of Untrusted Data in IBM WebSphere Application Server - CVE-2026-11536
Published: June 24, 2026
Vulnerability identifier: #VU135125
CSH Severity: Low
CVSS v4: 5.8 [CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H]
CVE-ID: CVE-2026-11536
CWE-ID: CWE-502
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to execute arbitrary code on the target system.
The vulnerability exists due to insecure input validation when processing serialized data. A remote user can pass specially crafted data to the application and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Affected software
IBM WebSphere Application Server
IBM Business Automation Workflow
Jazz for Service Management
IBM Security Guardium Key Lifecycle Manager (GKLM)
IBM Tivoli System Automation Application Manager
WebSphere Service Registry and Repository
WebSphere Remote Server
IBM Rational ClearQuest
Tivoli Network Manager IP Edition
IBM Tivoli Netcool Configuration Manager
Tivoli Composite Application Manager for Application Diagnostics
IBM Business Automation Workflow
Jazz for Service Management
IBM Security Guardium Key Lifecycle Manager (GKLM)
IBM Tivoli System Automation Application Manager
WebSphere Service Registry and Repository
WebSphere Remote Server
IBM Rational ClearQuest
Tivoli Network Manager IP Edition
IBM Tivoli Netcool Configuration Manager
Tivoli Composite Application Manager for Application Diagnostics
How to mitigate CVE-2026-11536
Install updates from vendor's website.
IBM WebSphere Application Server - addressed in versions 8.5.5.30, 9.0.5.29
External References
Related Security Bulletins
- Deserialization of untrusted data in IBM WebSphere Application Server
- Multiple vulnerabilities in IBM WebSphere Service Registry and Repository
- Deserialization of untrusted data in IBM WebSphere Remote Server
- Multiple vulnerabilities in IBM Buinses Automation Workflow
- Deserialization of untrusted data in IBM Guardium Key Lifecycle Manager (SKLM/GKLM)
- Deserialization of untrusted data in IBM Tivoli Composite Application Manager for Application Diagnostics
- Multiple vulnerabilities in IBM Tivoli Netcool Configuration Manager
- Deserialization of untrusted data in IBM Tivoli System Automation Application Manager
- Deserialization of untrusted data in IBM Rational ClearQuest
- Deserialization of untrusted data in IBM Jazz for Service Management
- Multiple vulnerabilities in IBM Tivoli Network Manager IP Edition