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IBM disclosed multiple vulnerabilities in the optional Web Server Plug-ins used with WebSphere Application Server and WebSphere Liberty, including CVE-2026-8633, a critical unauthenticated code injection flaw rated CVSS 9.8, and CVE-2026-8620, an HTTP request smuggling issue rated CVSS 7.5. The bugs affect supported 8.5 and 9.0 plug-in branches that sit in front of back-end WebSphere servers on platforms including Apache HTTP Server, Microsoft IIS, and IBM HTTP Server, allowing specially crafted HTTP requests to bypass trust boundaries, reach internal application servers, and potentially achieve arbitrary code execution and full system compromise.
IBM said no workarounds or mitigations are available and directed customers to apply interim fixes or upgrade to fixed plug-in versions tied to APAR PH71342, later updated under PH71376. IBM support notices said fixes were released through Fix Central for affected 9.0.5.24-9.0.5.27 and 8.5.5.25-8.5.5.29 ranges, with permanent remediation targeted for inclusion in WebSphere Application Server 9.0.5.28 and 8.5.5.30. The combined disclosure raised concern that request smuggling could help attackers bypass perimeter controls before exploiting the RCE flaw in exposed enterprise deployments.
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IBM's support notice states downloadable fixes were released on 16 June 2026 for affected version ranges and records that IFPH71342 was superseded by IFPH71376 the same day. The notice also says these fixes are targeted for later inclusion in WebSphere Application Server 9.0.5.28 and 8.5.5.30.
IBM released patches and interim fixes under APAR PH71342 for supported 8.5.5 and 9.0.5 Web Server Plug-ins branches. The fixes were issued as the primary remediation path because IBM stated no mitigations or workarounds were available.
IBM disclosed two vulnerabilities affecting the optional Web Server Plug-ins for WebSphere Application Server and Liberty: CVE-2026-8620, an HTTP request smuggling flaw, and CVE-2026-8633, a critical remote code execution flaw. IBM said no workarounds were available and directed customers to interim fixes and fixed plug-in versions under APAR PH71342.
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IBM disclosed a critical `CVE-2026-8633` vulnerability in WebSphere Application Server and WebSphere Liberty deployments that use the optional **Web Server Plug-ins** component, warning that unauthenticated attackers can send specially crafted HTTP requests to execute arbitrary commands on the host. The flaw, classified as improper control of code generation (`CWE-94`) and rated `CVSS 9.8`, affects WebSphere Application Server traditional and Liberty versions `8.5` and `9.0`, with successful exploitation potentially leading to full system compromise. IBM also patched `CVE-2026-8620`, an HTTP request smuggling issue that could let attackers bypass security controls and manipulate backend communications in affected environments. The company said both issues are addressed through **APAR `PH71342`** and related fix packs, and advised administrators to apply the fixes, validate updates in non-production environments, monitor HTTP traffic, restrict exposure of plug-in endpoints, use WAF protections, and perform threat hunting for signs of exploitation.
Jun 29, 2026
IBM disclosed multiple vulnerabilities in **WebSphere Application Server** and **WebSphere Application Server Liberty**, including denial-of-service issues tracked as `CVE-2026-9071` and `CVE-2026-9320`, and an HTTP request smuggling flaw, `CVE-2026-8646`, rated up to **CVSS 8.1**. The affected products include WebSphere Application Server **8.5** and **9.0**, along with WebSphere Liberty versions **17.0.0.3 through 26.0.0.6** when certain servlet or websocket features are enabled. IBM said no workarounds or mitigations are available and advised customers to apply interim fixes for **APAR PH71631** and **PH71370** or upgrade to fix packs **26.0.0.7**, **9.0.5.29**, or **8.5.5.30**. A related high-severity issue, `CVE-2026-9072`, affects **IBM i 7.3 through 7.6** in environments using WebSphere Application Server or Liberty with **Intelligent Management** and the **WebSphere WebServer Plug-in**. IBM said an attacker who can impersonate backend servers and send crafted responses to the plug-in could trigger **remote code execution** and **denial of service**, also with a **CVSS 8.1** rating. Recommended actions include installing the latest WebSphere security updates, updating IBM i to current levels, and reviewing the secure configuration of Intelligent Management and the WebSphere WebServer Plug-in.
Jun 29, 2026
IBM disclosed two vulnerabilities in traditional **IBM WebSphere Application Server** affecting versions **9.0** and **8.5**, led by **CVE-2026-14512**, a **pre-authentication unsafe deserialization** flaw rated **CVSS 9.8**. The issue could allow a remote attacker to **bypass authentication** or achieve **arbitrary code execution** without user interaction, creating a high-risk path to full compromise of exposed WebSphere environments. IBM also identified **CVE-2026-14528**, a **CVSS 7.4** flaw that could expose sensitive information through insertion into log files. The company directed customers to apply the interim fix for **APAR PH72166** or upgrade to **Fix Pack 9.0.5.29+** for WebSphere 9.0 and **Fix Pack 8.5.5.31+** for WebSphere 8.5, and said **no workarounds or mitigations are available**.
Jul 29, 2026