What is CVE-2026-11549?

CVE-2026-11549 is a medium-severity vulnerability in IBM Cics Tx Advanced, classified under Improper Access Control. CVSS score: 6.5/10. Published 2026-09-18.

How severe is CVE-2026-11549?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in IBM Cics Tx Advanced

CVE-2026-11549

IBM WebSphere Application Server and WebSphere Application Server Liberty are affected by a virtual host bypass vulnerability.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.

Affected products

Ibm Cics Tx Advanced — versions 10.1

Weakness classification (CWE)

CWE-284 — Improper Access Control

References

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

Frequently asked questions

What is CVE-2026-11549?: CVE-2026-11549 is a medium-severity vulnerability in IBM Cics Tx Advanced, classified under Improper Access Control. CVSS score: 6.5/10. Published 2026-09-18.
How severe is CVE-2026-11549?: Medium severity. CVSS v3 base score is 6.5 out of 10.