{"id":"CVE-2026-15396","title":"IBM WebSphere Application Server 9.0, and 8.5 and IBM WebSphere Application Server - Liberty are vulnerable to HTTP request smuggling, caused by improper parsing of the HTTP transfer-encoding request header","summary":"IBM WebSphere Application Server 9.0, and 8.5 and IBM WebSphere Application Server - Liberty are vulnerable to HTTP request smuggling, caused by improper parsing of the HTTP transfer-encoding request header. By sending a specially crafte…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","cwe":["CWE-444"],"vendor":"IBM","product":"WebSphere Application Server","affected":["websphere_application_server 9.0","websphere_application_server 8.5"],"published":"2026-09-14","updated":"2026-09-16","sourceUpdated":"2026-09-16T19:22:22.797","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-15396","references":[{"url":"https://www.ibm.com/support/pages/node/7286610","label":"psirt@us.ibm.com"}],"tags":["nvd","cve.org"],"epss":0.00252,"epssPercentile":0.16965,"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-15T14:37:20.678578Z"},"ingestedAt":"2026-09-14T20:14:21.142Z","slug":"CVE-2026-15396","body":"## Overview\n\nIBM WebSphere Application Server 9.0, and 8.5 and IBM WebSphere Application Server - Liberty 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}