Medium severity · published Sep 18, 2026
CVE-2026-11548
IBM WebSphere Application Server and IBM WebSphere Application Server - Liberty HTTP Request Smuggling
4.8
CVSS
0.3%
EPSS
No
On KEV
Description
IBM WebSphere Application Server 8.5 and 9.0, and and IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.8 are affected by an HTTP request smuggling vulnerability.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 17% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
WA
WebSphere Application Server · IBM
9.0; 8.5 · source: vendor
WA
WebSphere Application Server - Liberty · IBM
17.0.0.3 through 26.0.0.5 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-11548
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-11548
www.ibm.com
https://www.ibm.com/support/pages/node/7286610
www.ibm.com
https://www.ibm.com/support/pages/node/7286611
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