Review reviewCritical

CVE-2026-11541

IBM CICS Transaction Gateway for Multiplatforms, websphere application server

IBM CICS Transaction Gateway for Multiplatforms 9.1, 9.2, 9.3, and 10.1 IBM WebSphere Application Server 9.0, and 8.5 and IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.6 are affected by an HTTP request smuggling vulnerability.

CVSS: 9.8
EPSS: 0.26%
CISA KEV: Not listed
Published: 2026.07.01

PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability0.26%

Technical severityCVSS 9.8

Vulnerability overview

Affected product and versions

Product: IBM CICS Transaction Gateway for Multiplatforms, websphere application server
Affected versions: >= 9.1, >= 9.2, >= 9.3, >= 10.1, >= 8.5.0.0 < 8.5.5.31, >= 9.0.0.0 < 9.0.5.29, >= 17.0.0.3 <= 26.0.0.6
Fixed versions: 8.5.5.31, 9.0.5.29

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that IBM CICS Transaction Gateway for Multiplatforms, websphere application server and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE: CWE-444