CVE-2026-8858: CWE-94 Improper Control of Generation of Code ('Code Injection')
IBM i versions 7.3.0, 7.4.0, 7.5.0, and 7.6.0, along with IBM WebSphere Application Server and Liberty, have a vulnerability in the WebSphere Web Server Plug-in component. This flaw allows remote code execution and denial of service when an attacker impersonates the application server and sends crafted responses to the plug-in. The vulnerability is classified as CWE-94, indicating improper control of code generation (code injection). It has a high severity with a CVSS score of 7.5.
AI Analysis
Technical Summary
CVE-2026-8858 is a vulnerability affecting IBM i 7.3.0 through 7.6.0 and IBM WebSphere Application Server (including Liberty) in the WebSphere Web Server Plug-in component. The issue arises when an attacker impersonates the application server and sends specially crafted responses to the plug-in, enabling remote code execution and denial of service. The vulnerability is categorized under CWE-94 (Improper Control of Generation of Code), indicating a code injection flaw. The CVSS 3.1 base score is 7.5, reflecting high impact on confidentiality, integrity, and availability. No official remediation or patch information is currently available, and no known exploits in the wild have been reported.
Potential Impact
Successful exploitation can lead to remote code execution and denial of service on affected systems running IBM i 7.3.0, 7.4.0, 7.5.0, and 7.6.0, as well as IBM WebSphere Application Server and Liberty. This compromises system confidentiality, integrity, and availability by allowing an attacker to execute arbitrary code remotely and disrupt service. The attack requires the ability to impersonate the application server and send crafted responses to the WebSphere Web Server Plug-in component.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no official remediation level or patch links are provided, users should monitor IBM's security advisories for updates. Until a fix is available, restrict network access to the WebSphere Web Server Plug-in component to trusted sources and consider additional network-level protections to prevent impersonation attacks.
CVE-2026-8858: CWE-94 Improper Control of Generation of Code ('Code Injection')
Description
IBM i versions 7.3.0, 7.4.0, 7.5.0, and 7.6.0, along with IBM WebSphere Application Server and Liberty, have a vulnerability in the WebSphere Web Server Plug-in component. This flaw allows remote code execution and denial of service when an attacker impersonates the application server and sends crafted responses to the plug-in. The vulnerability is classified as CWE-94, indicating improper control of code generation (code injection). It has a high severity with a CVSS score of 7.5.
CVSS v3.1
Score 7.5high
Affected software
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:*:*:*:*:*:*:*Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-8858 is a vulnerability affecting IBM i 7.3.0 through 7.6.0 and IBM WebSphere Application Server (including Liberty) in the WebSphere Web Server Plug-in component. The issue arises when an attacker impersonates the application server and sends specially crafted responses to the plug-in, enabling remote code execution and denial of service. The vulnerability is categorized under CWE-94 (Improper Control of Generation of Code), indicating a code injection flaw. The CVSS 3.1 base score is 7.5, reflecting high impact on confidentiality, integrity, and availability. No official remediation or patch information is currently available, and no known exploits in the wild have been reported.
Potential Impact
Successful exploitation can lead to remote code execution and denial of service on affected systems running IBM i 7.3.0, 7.4.0, 7.5.0, and 7.6.0, as well as IBM WebSphere Application Server and Liberty. This compromises system confidentiality, integrity, and availability by allowing an attacker to execute arbitrary code remotely and disrupt service. The attack requires the ability to impersonate the application server and send crafted responses to the WebSphere Web Server Plug-in component.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no official remediation level or patch links are provided, users should monitor IBM's security advisories for updates. Until a fix is available, restrict network access to the WebSphere Web Server Plug-in component to trusted sources and consider additional network-level protections to prevent impersonation attacks.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- ibm
- Date Reserved
- 2026-05-18T18:06:05.131Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a39572aeed863c81e053843
Added to database: 06/22/2026, 15:39:22 UTC
Last enriched: 06/22/2026, 15:56:34 UTC
Last updated: 06/22/2026, 18:09:20 UTC
Views: 5
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