Deserialization of Untrusted Data in IBM WebSphere Application Server - CVE-2026-9330

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Main Vulnerability Database Vulnerabilities #VU133292

Deserialization of Untrusted Data in IBM WebSphere Application Server - CVE-2026-9330

Published: June 3, 2026


Vulnerability identifier: #VU133292
CSH Severity: Low
CVSS v4.0: 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/E:U/U:Clear
CVE-ID: CVE-2026-9330
CWE-ID: CWE-502
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vendor: IBM Corporation
Affected software:
IBM WebSphere Application Server

Detailed vulnerability description

The vulnerability allows a remote user to execute arbitrary code on the target system.

The vulnerability exists due to improper validation of user-supplied data during deserialization using the SAML Web Single Sign-On component. 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.


How to mitigate CVE-2026-9330

Install updates from vendor's website.

Sources