CVE-2026-15634
Medium
Description
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.
SeverityMedium
CVSS6.5
Exploit probability—
Product
Ibm Websphere Application Server
PublishedSep 14, 2026
First seenSep 14, 2026
Weakness typeCWE-444CWE-444
How to fix
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| ibm websphere_application_server | 9.0, 8.5 | — |
| ibm websphere_application_server_liberty | 17.0.0.3 ≤ v ≤ 26.0.0.5 | — |
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