What is CVE-2026-18499?

CVE-2026-18499 is a high-severity vulnerability in Ibm Websphere Application Server - Liberty, classified under Improper Authorization. CVSS score: 8.1/10. Published 2026-08-12.

How severe is CVE-2026-18499?

High severity. CVSS v3 base score is 8.1 out of 10.

Auth bypass in Ibm Websphere Application Server - Liberty

CVE-2026-18499

IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.8 is vulnerable to a privilege escalation when using Liberty collectives.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.

Affected products

Ibm Websphere Application Server - Liberty — versions 17.0.0.3

Weakness classification (CWE)

CWE-285 — Improper Authorization

References

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

Frequently asked questions

What is CVE-2026-18499?: CVE-2026-18499 is a high-severity vulnerability in Ibm Websphere Application Server - Liberty, classified under Improper Authorization. CVSS score: 8.1/10. Published 2026-08-12.
How severe is CVE-2026-18499?: High severity. CVSS v3 base score is 8.1 out of 10.