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

Published Jun 1, 2026
·
Updated

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.

Other sources

IBM WebSphere Application Server 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.

— IBM

Affected Software

5 affected components
IBM WebSphere Application Server=9.0, =8.5
IBM WebSphere Application Server<=9.0
IBM WebSphere Application Server<=8.5
IBM WebSphere Application Server>=8.5.0.0<8.5.5.30
IBM WebSphere Application Server>=9.0.0.0<9.0.5.29

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade IBM WebSphere Application Server traditional 8.5 to a version that resolves this vulnerability.

    Fixed in 8.5.5.30
  2. Upgrade

    Upgrade IBM WebSphere Application Server traditional 9.0 to a version that resolves this vulnerability.

    Fixed in 9.0.5.29
  3. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Patch PH71453
  4. Operational

    Apply the currently available interim fix or fix pack that contains the fix for APAR PH71453 to remediate the remote code execution issue in the SAML Web Single Sign-On deserialization path.

Event History

Jun 1, 2026
CVE Published
via IBM·12:00 AM
Data Sourced
via IBM·12:00 AM
DescriptionAffected Software
CVE Published
via MITRE·06:01 PM
Data Sourced
via MITRE·06:01 PM
RemedyDescriptionSeverityWeakness
Data Sourced
via NVD·07:16 PM
DescriptionSeverityWeaknessAffected Software
May 9, 58583
Event
via FIRST·01:10 AM

Parent advisories

This vulnerability appears in the following advisories.

Free Weekly Intel

Don't miss critical vulnerabilities

Join thousands of security professionals who receive our weekly digest of trending CVEs, zero-days, and exploited vulnerabilities.

No spam. Unsubscribe anytime.

Frequently Asked Questions

1

What is the severity of CVE-2026-9330?

CVE-2026-9330 has a high severity score of 8.5.

2

How do I fix CVE-2026-9330?

To fix CVE-2026-9330, apply the currently available interim fix or fix pack that addresses APAR PH71453.

3

What type of vulnerability is CVE-2026-9330?

CVE-2026-9330 is a remote code execution vulnerability due to improper validation of user-supplied data.

4

Which versions of IBM WebSphere Application Server are affected by CVE-2026-9330?

CVE-2026-9330 affects IBM WebSphere Application Server versions 9.0 and 8.5.

5

What could be the impact of CVE-2026-9330 if exploited?

If exploited, CVE-2026-9330 could allow an attacker to execute arbitrary code remotely on the affected system.

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2026 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203