Improper User Data Validation in IBM WebSphere Application Server
CVE-2026-9330

8.5HIGH

Key Information:

Vendor

IBM
Status
Websphere Application Server
Vendor
CVE Published:
1 June 2026

What is CVE-2026-9330?

IBM WebSphere Application Server versions 9.0 and 8.5 contain a vulnerability due to improper validation of user-supplied data during deserialization processes relating to the SAML Web Single Sign-On component. This weakness could allow an attacker to craft a malicious HTTP request that, when executed, may leverage existing functionalities to run arbitrary code remotely.

Affected Version(s)

WebSphere Application Server 9.0 <= 1.1.9.12

WebSphere Application Server 8.5

References

https://www.ibm.com/support/pages/node/7274733
vendor-advisorypatch

CVSS V3.1

Score:
8.5
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.