What is CVE-2026-8858?

CVE-2026-8858 is a high-severity vulnerability in Ibm I, classified under Code Injection. CVSS score: 7.5/10. Published 2026-06-22.

How severe is CVE-2026-8858?

High severity. CVSS v3 base score is 7.5 out of 10.

RCE in Ibm I

CVE-2026-8858

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…

Vulnerability class: RCE (Remote Code Execution)

EPSS: 0.003 (17.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Ibm I — versions 7.6.0, 7.5.0, 7.4.0
Ibm Websphere Application Server — versions 8.5, 9.0

Weakness classification (CWE)

CWE-94 — Code Injection

References

psirt@us.ibm.com (vendor-advisory, patch, Vendor Advisory)
psirt@us.ibm.com (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-8858?: CVE-2026-8858 is a high-severity vulnerability in Ibm I, classified under Code Injection. CVSS score: 7.5/10. Published 2026-06-22.
How severe is CVE-2026-8858?: High severity. CVSS v3 base score is 7.5 out of 10.