# CVE-2026-15634

## Summary

- **CVE ID:** CVE-2026-15634
- **Severity:** MEDIUM
- **CVSS Score:** 6.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N)
- **CWE:** CWE-444
- **Published:** Sep 14, 2026
- **Last Modified:** Sep 15, 2026

## Description

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 Products

- IBM — WebSphere Application Server (9.0)
- IBM — WebSphere Application Server (8.5)

## References

- [CNA](https://www.ibm.com/support/pages/node/7286610)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.25%
- **EPSS Percentile:** 16.8

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-17._