CVE-2026-8858

Name: CVE-2026-8858
Creator: NVD / NIST
Published: 2026-06-22T16:16:42.967+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 0.26%

Last modified Jun 24, 2026

CVE-2026-8858 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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.. EPSS estimates a 0.26% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8.8/10

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.26%

17.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-94

Affected Software

Vendor	Product	Versions
Ibm	I	>= 7.3, <= 7.6

References

https://www.ibm.com/support/pages/node/7277344Vendor Advisory

Timeline

Published: Jun 22, 2026
Last Modified: Jun 24, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2026-8858?

How severe is CVE-2026-8858?

CVE-2026-8858 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.26% probability of exploitation in the next 30 days.

How do I fix CVE-2026-8858?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-8858?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST