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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.
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A high-severity entry for CVE-2026-9072 described IBM i 7.3 through 7.6 deployments using WebSphere Application Server or WebSphere Application Server Liberty with Intelligent Management and the WebSphere WebServer Plug-in as vulnerable. The flaw can enable remote code execution and denial of service via crafted responses from an attacker impersonating backend servers, and the advisory recommended applying IBM security updates and updating IBM i.
IBM published a security bulletin disclosing CVE-2026-9071, CVE-2026-9320, and CVE-2026-8646 affecting WebSphere Application Server and WebSphere Application Server Liberty, including denial-of-service and HTTP request smuggling issues. IBM said affected products should receive interim fixes or upcoming fix packs and noted no workarounds or mitigations were available.
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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.
Jul 12, 2026
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 high-severity vulnerabilities affecting **WebSphere** and **webMethods Integration Server**, exposing enterprise middleware environments to remote compromise. In WebSphere, the reported issues include remote code execution flaws tracked as `CVE-2026-9311`, `CVE-2026-9330`, and `CVE-2026-9319`, alongside an authentication bypass and identity spoofing issue, `CVE-2026-8644`. Affected deployments include traditional WebSphere versions **9.0** and **8.5**, with IBM issuing interim fixes through specific APARs and urging administrators to verify configurations and apply patches quickly. A separate IBM advisory covers **webMethods Integration Server** `CVE-2025-36072`, a deserialization-based remote code execution flaw that can be exploited by an authenticated attacker with service execution privileges through internal APIs or protocols such as `IDataBin`. The vulnerability affects versions **10.11** through `10.11_Core_Fix22`, **10.15** through `10.15_Core_Fix22`, and **11.1** through `11.1_Core_Fix6` if they have not received the latest core fixes. Successful exploitation could allow arbitrary code execution in the Integration Server process, enabling lateral movement, persistence, and data exfiltration across business-critical systems.
Jun 29, 2026