CVE-2026-8620
Analyzed Analyzed - Analysis Complete
HTTP Request Smuggling in IBM WebSphere Plug-ins

Publication date: 2026-05-26

Last updated on: 2026-06-02

Assigner: IBM Corporation

Description
IBM Web Server Plug-ins for WebSphere Application Server and WebSphere Liberty 8.5, 9.0 IBM WebSphere Application Server and WebSphere Application Server Liberty are vulnerable to HTTP request smuggling in the Web Server Plug-ins through a specially crafted request.
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Meta Information
Published
2026-05-26
Last Modified
2026-06-02
Generated
2026-06-16
AI Q&A
2026-05-26
EPSS Evaluated
2026-06-14
NVD
CVE-2026-8620
EUVD
EUVD-2026-31921
Affected Vendors & Products
Showing 4 associated CPEs
Vendor Product Version / Range
ibm websphere_application_server From 8.5.0.0 (inc) to 8.5.5.30 (exc)
ibm websphere_application_server From 9.0.0.0 (inc) to 9.0.5.28 (exc)
ibm websphere_application_server From 8.5.0.0 (inc) to 8.5.5.30 (exc)
ibm websphere_application_server From 9.0.0.0 (inc) to 9.0.5.28 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-444 The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.
Attack-Flow Graph
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Executive Summary

CVE-2026-8620 is a vulnerability in IBM WebSphere Application Server and WebSphere Application Server Liberty when using the optional Web Server Plug-ins component.

It allows HTTP request smuggling through specially crafted requests, enabling attackers to manipulate how requests are interpreted by the server.

Impact Analysis

This vulnerability has a high severity with a CVSS base score of 7.5.

It can impact confidentiality and integrity by allowing attackers to manipulate HTTP requests, potentially leading to unauthorized access or data manipulation.

Mitigation Strategies

IBM recommends applying interim fixes or future fix packs (9.0.5.28+ or 8.5.5.30+) to address the vulnerability in IBM WebSphere Application Server and WebSphere Application Server Liberty when using the Web Server Plug-ins component.

No workarounds are currently available, so applying the provided fixes is the immediate step to mitigate this vulnerability.

Compliance Impact

CVE-2026-8620 allows HTTP request smuggling, which can impact the confidentiality and integrity of data processed by IBM WebSphere Application Server and its Web Server Plug-ins. Such impacts on confidentiality and integrity could potentially affect compliance with standards and regulations like GDPR and HIPAA that require protection of sensitive data.

However, the provided information does not explicitly describe how this vulnerability affects compliance with specific standards or regulations.

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