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CVE-2026-15634— IBM WebSphere Application Server prior to 9.0.5.29 and 8.5.5.31 are affected by multiple vulnerabilities

Quick assessment

Affected
IBM WebSphere Application Server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

IBM WebSphere Application Server 9.0 和 8.5，以及 IBM WebSphere Application Server - Liberty 存在 HTTP 请求走私（HTTP request smuggling）漏洞，其根本原因在于对 HTTP 请求头的解析不当。攻击者可以通过发送一个经过特殊构造的 HTTP 请求头来利用此漏洞，从而： 1. 污染 Web 缓存； 2. 绕过 Web 应用防火墙（WAF）的保护； 3. 实施跨站脚本（XSS）攻击。

CVSS 6.5 · Medium

Possible ATT&CK Techniques 1 AI

T1597.002 · Purchase Technical Data
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I. Basic Information for CVE-2026-15634

Vulnerability Information
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Vulnerability Title
IBM WebSphere Application Server prior to 9.0.5.29 and 8.5.5.31 are affected by multiple vulnerabilities
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
HTTP请求的解释不一致性(HTTP请求私运)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
IBM WebSphere Application Server 9.0 cpe:2.3:a:ibm:websphere_application_server:9.0:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-15634

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III. Intelligence Information for CVE-2026-15634

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Vendor Advisories for CVE-2026-15634 (1)

Same Patch Batch · IBM · 2026-09-14 · 61 CVEs total

CVE-2026-16338 9.9 CRITICAL DataStage on Cloud Pak for Data has several vulnerabilities due to open source software
CVE-2026-12944 9.6 CRITICAL Incomplete Security Scanner Blocklist Enables Network-Based Code Execution
CVE-2026-16428 8.8 HIGH DataStage on Cloud Pak for Data has several vulnerabilities due to open source software
CVE-2026-16466 8.8 HIGH DataStage on Cloud Pak for Data has several vulnerabilities due to open source software
CVE-2026-13293 8.8 HIGH IBM MQ Java messaging is vulnerable to remote code execution
CVE-2026-16673 8.8 HIGH DataStage on Cloud Pak for Data has several vulnerabilities due to open source software
CVE-2026-17467 8.2 HIGH Vulnerabilities exists in IBM Cloud Pak for Data System
CVE-2026-16335 8.1 HIGH DataStage on Cloud Pak for Data has several vulnerabilities due to open source software
CVE-2026-17416 7.8 HIGH IBM App Connect Enterprise Toolkit is vulnerable to arbitrary code execution due to multip
CVE-2026-17156 7.8 HIGH IBM App Connect Enterprise Toolkit is vulnerable to arbitrary code execution due to multip
CVE-2026-17133 7.8 HIGH IBM App Connect Enterprise Toolkit is vulnerable to arbitrary code execution due to multip
CVE-2026-16432 7.7 HIGH DataStage on Cloud Pak for Data has several vulnerabilities due to open source software
CVE-2026-15955 7.5 HIGH IBM® Data Server driver for JDBC and SQLJ could allow a remote attacker to perform an arbi
CVE-2026-19290 7.5 HIGH IBM Sterling File Gateway is Vulnerable to Improper Access Control
CVE-2026-13107 7.1 HIGH Multiple secuirty vulnerabilies addressed with IBM Business Automation Workflow August 202
CVE-2026-13275 7.1 HIGH IBM MQ Managed File Transfer is vulnerable to XML external entity injection
CVE-2026-12756 7.1 HIGH Multiple secuirty vulnerabilies addressed with IBM Business Automation Workflow August 202
CVE-2026-13287 7.1 HIGH IBM MQ Managed File Transfer is vulnerable to XML external entity injection
CVE-2026-13285 7.1 HIGH IBM MQ Managed File Transfer is vulnerable to XML external entity injection
CVE-2026-13265 6.8 MEDIUM IBM MQ Managed File Transfer REST API is vulnerable to XML external entity injection

Showing top 20 of 61 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: WebSphere Application Server
Same vendor: IBM
Same weakness: CWE-444

V. Comments for CVE-2026-15634

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