1. Home
  2. Vulnerabilities
  3. CVE-2026-8858
8.8
HIGH CVSS 3.1
CVE-2026-8858
WebSphere Application Server Remote Code Execution
Overview
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.

Details
INFO

Published Date :

June 22, 2026, 4:16 p.m.

Last Modified :

July 9, 2026, 9:16 p.m.

Remotely Exploit :

No

Source :

[email protected]
Impact
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 websphere_application_server
2 Ibm i
3 Ibm i
: Total Affected Vendor : 1 | Products : 3
Scoring
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 134c704f-9b21-4f2e-91b3-4a467353bcc0
CVSS 3.1 HIGH 9a959283-ebb5-44b6-b705-dcc2bbced522
CVSS 3.1 HIGH [email protected]
CVSS 3.1 HIGH [email protected]
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.
References
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-8858.

URL Resource
https://www.ibm.com/support/pages/node/7276560
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-8858 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-8858 weaknesses.

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.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-8858 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by [email protected]

    Jul. 09, 2026

    Action Type Old Value New Value
    Added Reference https://www.ibm.com/support/pages/node/7276560
    Removed Reference https://www.ibm.com/support/pages/node/7277344
    Removed Reference Type https://www.ibm.com/support/pages/node/7277344 Types: Vendor Advisory
    Changed Affected [{'cpes': ['cpe:2.3:a:ibm:i:7.6:*:*:*:*:*:*:*', 'cpe:2.3:a:ibm:i:7.6.0:*:*:*:*:*:*:*', 'cpe:2.3:a:ibm:i:7.5:*:*:*:*:*:*:*', 'cpe:2.3:a:ibm:i:7.5.0:*:*:*:*:*:*:*', 'cpe:2.3:a:ibm:i:7.4:*:*:*:*:*:*:*', 'cpe:2.3:a:ibm:i:7.4.0:*:*:*:*:*:*:*', 'cpe:2.3:a:ibm:i:7.3:*:*:*:*:*:*:*', 'cpe:2.3:a:ibm:i:7.3.0:*:*:*:*:*:*:*'], 'vendor': 'IBM', 'product': 'i', 'versions': [{'status': 'affected', 'version': '7.6.0', 'versionType': 'semver', 'lessThanOrEqual': '1.8.4'}, {'status': 'affected', 'version': '7.5.0', 'versionType': 'semver'}, {'status': 'affected', 'version': '7.4.0', 'versionType': 'semver'}, {'status': 'affected', 'version': '7.3.0', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}] [{'cpes': ['cpe:2.3:a:ibm:websphere_application_server:8.5:*:*:*:*:*:*:*', 'cpe:2.3:a:ibm:websphere_application_server:9.0:*:*:*:*:*:*:*'], 'vendor': 'IBM', 'product': 'WebSphere Application Server', 'versions': [{'status': 'affected', 'version': '8.5'}, {'status': 'affected', 'version': '9.0'}], 'defaultStatus': 'unaffected'}]
  • CVE Modified by [email protected]

    Jun. 24, 2026

    Action Type Old Value New Value
    Changed Affected [{'cpes': ['cpe:2.3:a:ibm:i:7.6:*:*:*:*:*:*:*', 'cpe:2.3:a:ibm:i:7.6.0:*:*:*:*:*:*:*', 'cpe:2.3:a:ibm:i:7.5:*:*:*:*:*:*:*', 'cpe:2.3:a:ibm:i:7.5.0:*:*:*:*:*:*:*', 'cpe:2.3:a:ibm:i:7.4:*:*:*:*:*:*:*', 'cpe:2.3:a:ibm:i:7.4.0:*:*:*:*:*:*:*', 'cpe:2.3:a:ibm:i:7.3:*:*:*:*:*:*:*', 'cpe:2.3:a:ibm:i:7.3.0:*:*:*:*:*:*:*'], 'vendor': 'IBM', 'product': 'i', 'versions': [{'status': 'affected', 'version': '7.6.0', 'versionType': 'semver', 'lessThanOrEqual': '1.8.4'}, {'status': 'affected', 'version': '7.5.0', 'versionType': 'semver'}, {'status': 'affected', 'version': '7.4.0', 'versionType': 'semver'}, {'status': 'affected', 'version': '7.3.0', 'versionType': 'semver'}]}] [{'cpes': ['cpe:2.3:a:ibm:i:7.6:*:*:*:*:*:*:*', 'cpe:2.3:a:ibm:i:7.6.0:*:*:*:*:*:*:*', 'cpe:2.3:a:ibm:i:7.5:*:*:*:*:*:*:*', 'cpe:2.3:a:ibm:i:7.5.0:*:*:*:*:*:*:*', 'cpe:2.3:a:ibm:i:7.4:*:*:*:*:*:*:*', 'cpe:2.3:a:ibm:i:7.4.0:*:*:*:*:*:*:*', 'cpe:2.3:a:ibm:i:7.3:*:*:*:*:*:*:*', 'cpe:2.3:a:ibm:i:7.3.0:*:*:*:*:*:*:*'], 'vendor': 'IBM', 'product': 'i', 'versions': [{'status': 'affected', 'version': '7.6.0', 'versionType': 'semver', 'lessThanOrEqual': '1.8.4'}, {'status': 'affected', 'version': '7.5.0', 'versionType': 'semver'}, {'status': 'affected', 'version': '7.4.0', 'versionType': 'semver'}, {'status': 'affected', 'version': '7.3.0', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}]
    Changed 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. 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.
  • Initial Analysis by [email protected]

    Jun. 23, 2026

    Action Type Old Value New Value
    Added CVSS V3.1 AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    Added CPE Configuration AND OR *cpe:2.3:a:ibm:i:*:*:*:*:*:*:*:* versions from (including) 7.3 up to (including) 7.6 OR cpe:2.3:o:ibm:i:-:*:*:*:*:*:*:*
    Added Reference Type IBM Corporation: https://www.ibm.com/support/pages/node/7277344 Types: Vendor Advisory
  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Jun. 23, 2026

    Action Type Old Value New Value
    Changed SSVC {'id': 'CVE-2026-8858', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-06-22T00:00:00+00:00'} {'id': 'CVE-2026-8858', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-06-23T03:56:00.365269Z'}
  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Jun. 23, 2026

    Action Type Old Value New Value
    Added SSVC {'id': 'CVE-2026-8858', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-06-22T00:00:00+00:00'}
  • New CVE Received by [email protected]

    Jun. 22, 2026

    Action Type Old Value New Value
    Added Affected [{'cpes': ['cpe:2.3:a:ibm:i:7.6:*:*:*:*:*:*:*', 'cpe:2.3:a:ibm:i:7.6.0:*:*:*:*:*:*:*', 'cpe:2.3:a:ibm:i:7.5:*:*:*:*:*:*:*', 'cpe:2.3:a:ibm:i:7.5.0:*:*:*:*:*:*:*', 'cpe:2.3:a:ibm:i:7.4:*:*:*:*:*:*:*', 'cpe:2.3:a:ibm:i:7.4.0:*:*:*:*:*:*:*', 'cpe:2.3:a:ibm:i:7.3:*:*:*:*:*:*:*', 'cpe:2.3:a:ibm:i:7.3.0:*:*:*:*:*:*:*'], 'vendor': 'IBM', 'product': 'i', 'versions': [{'status': 'affected', 'version': '7.6.0', 'versionType': 'semver', 'lessThanOrEqual': '1.8.4'}, {'status': 'affected', 'version': '7.5.0', 'versionType': 'semver'}, {'status': 'affected', 'version': '7.4.0', 'versionType': 'semver'}, {'status': 'affected', 'version': '7.3.0', 'versionType': 'semver'}]}]
    Added 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.
    Added CVSS V3.1 AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
    Added CWE CWE-94
    Added Reference https://www.ibm.com/support/pages/node/7277344
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.
CVSS
Vulnerability Scoring Details
Base CVSS Score: 8.8
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact