CVE-2026-9311: 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 vulnerable to remote code execution caused by the bypass of security controls.

Other sources

IBM WebSphere Application Server is vulnerable to remote code execution caused by the bypass of security controls.

— 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 to a version that resolves this vulnerability.

    Fixed in 8.5.5.30
  2. Upgrade

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

    Fixed in 9.0.5.29
  3. Upgrade

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

    Patch PH71453

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·05:49 PM
Data Sourced
via MITRE·05:49 PM
RemedyDescriptionSeverityWeakness
Data Sourced
via NVD·07:16 PM
DescriptionSeverityWeaknessAffected Software
Apr 28, 58520
Event
via FIRST·10:14 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-2026-9311?

CVE-2026-9311 has a critical severity rating of 9.

2

What is CVE-2026-9311?

CVE-2026-9311 describes a remote code execution vulnerability in IBM WebSphere Application Server caused by the bypass of security controls.

3

How do I fix CVE-2026-9311?

To fix CVE-2026-9311, IBM recommends applying an interim fix or fix pack that addresses APAR PH71453.

4

Which versions of IBM WebSphere are affected by CVE-2026-9311?

CVE-2026-9311 affects IBM WebSphere Application Server versions 9.0 and 8.5.

5

What type of vulnerability is CVE-2026-9311?

CVE-2026-9311 is classified as a code injection vulnerability leading to remote code execution.

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