---
id: CVE-2026-11549
title: >-
  IBM WebSphere Application Server and WebSphere Application Server Liberty are
  affected by a virtual host bypass vulnerability.
summary: >-
  IBM WebSphere Application Server and WebSphere Application Server Liberty are
  affected by a virtual host bypass vulnerability.
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N'
cwe:
  - CWE-284
vendor: IBM
product: CICS TX Advanced
affected:
  - cics_tx_advanced 10.1
published: '2026-09-18'
updated: '2026-09-22'
sourceUpdated: '2026-09-22T19:32:25.730'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-11549'
references:
  - url: 'https://www.ibm.com/support/pages/node/7287740'
    label: psirt@us.ibm.com
tags:
  - nvd
  - cve.org
epss: 0.00229
epssPercentile: 0.12172
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-18T19:45:27.591407Z'
ingestedAt: '2026-09-18T19:49:30.582Z'
---

## Overview

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

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.