CVE-2026-9330 IBM WebSphere Application Server is affected by remote code execution

High 8.5 Published 1 Jun 2026 Updated 2 Jun 2026

Remote attackers can execute arbitrary code on IBM WebSphere Application Server by sending crafted HTTP requests to the SAML SSO component.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-9330?

CVE-2026-9330 is a high-severity unsafe deserialization vulnerability in Ibm Websphere Application Server, published on 1 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

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.

Weakness: CWE-502

Which versions are affected by CVE-2026-9330?

It affects 1 product.

Products include Ibm Websphere Application Server.

How do I fix CVE-2026-9330?

No fix has been published for CVE-2026-9330 yet. Limit exposure of the affected software until one is available.

Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.

Is CVE-2026-9330 being exploited?

There is no known exploitation of CVE-2026-9330 in the wild and no public exploit code.

All Ibm Websphere Application Server vulnerabilities

Sources

Also known as GHSA-xrfh-q76x-p6f2.