Is CVE-2026-8858 actively exploited?

No active exploitation of CVE-2026-8858 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-8858 be exploited remotely?

Partially. CVE-2026-8858 requires adjacent network access (same network segment) to exploit.

What is the CVSS score of CVE-2026-8858?

CVE-2026-8858 has a CVSS score of 8.8 (HIGH).

HOME VULNERABILITIESCVE-2026-8858

HIGH

CVE-2026-8858

CWE-94Published: June 22, 2026· Updated: Jun 24, 2026

8.8

CVSS v3.1

EPSS:0.25%probability of exploitation in 30 daysPercentile:16.0th

Official 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.

NVD Source

Technical Analysis

CVE-2026-8858 requires adjacent network access, limiting remote exploitation but still posing risk in shared or local network environments.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.8.