Deserialization of Untrusted Data in IBM WebSphere Application Server - CVE-2026-9319

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Main Vulnerability Database Vulnerabilities #VU133289

Deserialization of Untrusted Data in IBM WebSphere Application Server - CVE-2026-9319

Published: June 3, 2026


Vulnerability identifier: #VU133289
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H/E:U/U:Amber
CVE-ID: CVE-2026-9319
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 attacker to execute arbitrary code on the target system.

The vulnerability exists due to deserialization of untrusted data via JAX-WS endpoints with WS-Security. A remote attacker 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-2026-9319

Install updates from vendor's website.

Sources