CVE-2026-9330

EUVD-2026-33740
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 request when combined with a suitable gadget chain.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
ibmCNA
8.5 HIGH
NETWORK
HIGH
LOW
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 38%
Affected Products (NVD)
VendorProductVersion
ibmwebsphere_application_server
8.5.0.0 ≤
𝑥
< 8.5.5.30
ibmwebsphere_application_server
9.0.0.0 ≤
𝑥
< 9.0.5.29
𝑥
= Vulnerable software versions
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
ibmwebsphere
9.0 ≤
𝑥
≤ 1.1.9.12
CNA
ibmwebsphere
8.5
CNA
Common Weakness Enumeration
References
https://www.ibm.com/support/pages/node/7274733