What is CVE-2026-11594?

CVE-2026-11594 is a high-severity vulnerability in IBM Websphere Application Server, classified under Cross-site Scripting. CVSS score: 8.5/10. Published 2026-06-30.

How severe is CVE-2026-11594?

High severity. CVSS v3 base score is 8.5 out of 10.

XSS in IBM Websphere Application Server

CVE-2026-11594

IBM WebSphere Application Server 9.0, and 8.5 is affected by a cross-site scripting vulnerability in the administrative console.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2026-06-30 · last modified 2026-07-02.

CVSS v3 metric

CVSS v3 base score 8.5 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.003 (24.8th percentile), scored 2026-10-03.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 25th percentile — 24.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

IBM Websphere Application Server — versions 9.0, 8.5
IBM Websphere Application Server

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

www.ibm.com/support/pages/node/7277546 (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-11594?: CVE-2026-11594 is a high-severity vulnerability in IBM Websphere Application Server, classified under Cross-site Scripting. CVSS score: 8.5/10. Published 2026-06-30.
How severe is CVE-2026-11594?: High severity. CVSS v3 base score is 8.5 out of 10.