IBMCVE-2026-15396
IBM WebSphere Application Server: request smuggling
Medium6.5CVE-2026-15396 · Published Sep 14, 2026 · updated Sep 16, 2026
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 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.
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| WebSphere Application Server Product | <= 9.0 | No fix yet |
| <= 8.5 | No fix yet |
Details and references
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
- Severity from
- the vendor (its own CVE record or advisory)
- Weakness
- CWE-444
More IBM advisories
All IBM| Date | Advisory | Severity | Fixed in |
|---|---|---|---|
| Sep 14 | IBM MQ: information disclosure | Medium6.8 | No fix yet |
| Sep 14 | IBM Business Automation Workflow containers and traditional: XML external entity | High7.1 | No fix yet |
| Sep 14 | IBM Cloud Pak for Business Automation: missing authorization | Medium5.4 | No fix yet |
| Sep 14 | IBM Cloud Pak for Business Automation: denial of service | Medium6.5 | No fix yet |
| Sep 14 | IBM Langflow OSS: server-side request forgery | Critical9.6 | No fix yet |
| Sep 14 | IBM Sterling Secure Proxy: improper authorization | Medium4.3 | No fix yet |