What is CVE-2026-9330?

CVE-2026-9330 is a high-severity vulnerability in Ibm Websphere Application Server, classified under Deserialization of Untrusted Data. CVSS score: 8.5/10. Published 2026-06-01.

How severe is CVE-2026-9330?

High severity. CVSS v3 base score is 8.5 out of 10.

Deserialization in Ibm Websphere Application Server

CVE-2026-9330

IBM WebSphere Application Server 9.0, and 8.5 is affected by an improper validation of user-supplied data during deserialization using the SAML Web Single Sign-On component. This could result in remote code execution via a crafted HTTP req…

Vulnerability class: Insecure Deserialization

EPSS: 0.004 (58.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H.

Affected products

Ibm Websphere Application Server — versions 9.0, 8.5
Ibm Websphere_application_server

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

psirt@us.ibm.com (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-9330?: CVE-2026-9330 is a high-severity vulnerability in Ibm Websphere Application Server, classified under Deserialization of Untrusted Data. CVSS score: 8.5/10. Published 2026-06-01.
How severe is CVE-2026-9330?: High severity. CVSS v3 base score is 8.5 out of 10.