What is CVE-2026-4418?

CVE-2026-4418 is a medium-severity vulnerability in IBM Cloud Pak System, classified under Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS). CVSS score: 5.4/10. Published 2026-10-19.

How severe is CVE-2026-4418?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in IBM Cloud Pak System

CVE-2026-4418

IBM Cloud Pak System 2.3.6.0, and 2.3.6.1 is vulnerable to HTML injection. A remotely authenticated attacker could inject malicious HTML code, which when viewed, would be executed in the victim's Web browser within the security context of the hosting site.

Published 2026-10-19 · last modified 2026-10-19.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

IBM Cloud Pak System — versions 2.3.6.0, 2.3.6.1

Weakness classification (CWE)

CWE-80 — Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)

References

www.ibm.com/support/pages/node/7290183 (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-4418?: CVE-2026-4418 is a medium-severity vulnerability in IBM Cloud Pak System, classified under Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS). CVSS score: 5.4/10. Published 2026-10-19.
How severe is CVE-2026-4418?: Medium severity. CVSS v3 base score is 5.4 out of 10.