CVE-2026-8858

High

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.

SeverityHigh

CVSS7.5

Exploit probability—

Product

PublishedJun 22, 2026

First seenJun 22, 2026

Weakness typeCWE-94Code injection

How to fix

Patches

ibm.com/support/pages/node/7276560

Affected products

Product	Affected versions	Fixed in
ibm i	7.3 ≤ v ≤ 7.6	—

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