7.5
HIGH CVSS 3.1
CVE-2026-8858
IBM i is Affected By Denial of Service, HTTP Request Smuggling, and Remote Code Execution Vulnerabilities in IBM WebSphere Application Server Liberty [, , , , ]
Description

IBM i 7.6, 7.5, 7.4, and 7.3, 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.

INFO

Published Date :

June 22, 2026, 2:16 p.m.

Last Modified :

June 22, 2026, 2:19 p.m.

Remotely Exploit :

No

Source :

ibm
Affected Products

The following products are affected by CVE-2026-8858 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Ibm i
2 Ibm i
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 HIGH 9a959283-ebb5-44b6-b705-dcc2bbced522
Solution
Apply security updates to WebSphere Application Server and its plug-in.
  • Update IBM i systems to the latest version.
  • Apply necessary WebSphere Application Server updates.
  • Update the WebSphere Web Server Plug-in component.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-8858 vulnerability anywhere in the article.

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.