CVE-2026-15396
IBM WebSphere Application Server IBM WebSphere Application Server - Liberty HTTP Request Smuggling
CVSS Score
6.5
EPSS Score
0.0%
EPSS Percentile
0th
IBM WebSphere Application Server 8.5 and 9.0, and IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.8 are vulnerable to HTTP request smuggling, caused by improper parsing of the HTTP transfer-encoding request header. By sending a specially crafted HTTP transfer-encoding request header, an attacker could exploit this vulnerability to poison the web cache, bypass web application firewall protection, and conduct XSS attacks.
| CWE | CWE-444 |
| Vendor | ibm |
| Product | websphere application server |
| Published | Sep 14, 2026 |
| Last Updated | Oct 22, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None
Affected Versions
IBM / WebSphere Application Server
9.0 8.5
IBM / WebSphere Application Server - Liberty
17.0.0.3 ≤ 26.0.0.5