CVE-2026-8858
Modified Modified - Updated After Analysis

Remote Code Execution in IBM WebSphere Web Server Plug-in

Publication date: 2026-06-22

Last updated on: 2026-07-09

Assigner: IBM Corporation

Description
IBM WebSphere Application Server and IBM WebSphere Application Server Liberty are vulnerable to remote code execution and denial of service in the WebSphere Web Server Plug-in component. This vulnerability can be exploited when an attacker impersonates the application server and sends crafted responses to the plug-in.

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Meta Information

Published
2026-06-22
Last Modified
2026-07-09
Generated
2026-07-13
AI Q&A
2026-06-22
EPSS Evaluated
2026-07-11
NVD
CVE-2026-8858
EUVD
EUVD-2026-38284

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
ibm i From 7.3 (inc) to 7.6 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-94 The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.

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Executive Summary

CVE-2026-8858 is a vulnerability in IBM WebSphere Application Server and IBM WebSphere Application Server Liberty, specifically in the WebSphere Web Server Plug-in component. It allows an attacker to perform remote code execution and denial of service attacks by impersonating the application server and sending specially crafted responses to the plug-in.

This issue is classified under CWE-94, which relates to improper control of code generation, commonly known as code injection.

Impact Analysis

This vulnerability can have serious impacts including allowing attackers to remotely execute arbitrary code on the affected system and cause denial of service conditions. This means attackers could potentially take control of the system, disrupt services, or cause the application server to become unavailable.

Mitigation Strategies

To mitigate the vulnerability CVE-2026-8858 in IBM WebSphere Application Server and IBM WebSphere Application Server Liberty, IBM recommends applying the provided PTFs specific to your IBM i version.

  • Apply PTF SJ10119 for IBM i version 7.3
  • Apply PTF SJ10120 for IBM i version 7.4
  • Apply PTF SJ10121 for IBM i version 7.5
  • Apply PTF SJ10122 for IBM i version 7.6

No workarounds are currently available, so applying these patches is the immediate and recommended step.

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