Critical severity · published Jun 30, 2026
CVE-2026-11541
Inconsistent Interpretation of HTTP Requests in CICS Transaction Gateway for Multiplatforms.
9.8
CVSS
0.4%
EPSS
No
On KEV
Description
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 36% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CT
CICS Transaction Gateway for Multiplatforms · IBM
9.1; 9.2; 9.3; 10.1 · source: vendor
WA
Websphere Application Server · Ibm
8.5.0.0 before 8.5.5.31; 9.0.0.0 before 9.0.5.29; 17.0.0.3 through 26.0.0.6 · source: NVD
Affected product
CT
CICS Transaction Gateway for Multiplatforms
IBM