CVE-2026-9311

Name: CVE-2026-9311
Creator: NVD / NIST
Published: 2026-06-01T19:16:55.537+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9/10EPSS 0.49%

Last modified Jun 17, 2026

CVE-2026-9311 is a critical-severity vulnerability rated 9/10 on the CVSS scale. IBM WebSphere Application Server 9.0, and 8.5 is vulnerable to remote code execution caused by the bypass of security controls.. EPSS estimates a 0.49% chance of exploitation in the next 30 days.

Description

IBM WebSphere Application Server 9.0, and 8.5 is vulnerable to remote code execution caused by the bypass of security controls.

Metrics

CVSS 3.1

9/10

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

EPSS Probability

0.49%

38.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-94

Affected Software

Vendor	Product	Versions
Ibm	Websphere Application Server	>= 8.5.0.0, < 8.5.5.30
Ibm	Websphere Application Server	>= 9.0.0.0, < 9.0.5.29

References

https://www.ibm.com/support/pages/node/7274733Vendor Advisory

Timeline

Published: Jun 1, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-9311?

IBM WebSphere Application Server 9.0, and 8.5 is vulnerable to remote code execution caused by the bypass of security controls.

How severe is CVE-2026-9311?

CVE-2026-9311 has a CVSS score of 9/10 (CRITICAL severity). The EPSS model estimates a 0.49% probability of exploitation in the next 30 days.

How do I fix CVE-2026-9311?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-9311?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST