What is CVE-2026-16186?

CVE-2026-16186 is a medium-severity vulnerability in IBM Websphere Application Server, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-09-14.

How severe is CVE-2026-16186?

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

XSS in IBM Websphere Application Server

CVE-2026-16186

IBM WebSphere Application Server 9.0, and 8.5 is affected by a reflected cross-site scripting vulnerability.

Vulnerability class: XSS (Cross-Site Scripting)

CVSS v3 metric

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

Affected products

Ibm Websphere Application Server — versions 8.5, 9.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

psirt@us.ibm.com (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-16186?: CVE-2026-16186 is a medium-severity vulnerability in IBM Websphere Application Server, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-09-14.
How severe is CVE-2026-16186?: Medium severity. CVSS v3 base score is 5.4 out of 10.