IBM i up to 1.8.4/7.3.0/7.4.0/7.5.0 code injection

Summaryinfo

A vulnerability, which was classified as critical, has been found in IBM i up to 1.8.4/7.3.0/7.4.0/7.5.0. The impacted element is an unknown function. This manipulation causes code injection. The identification of this vulnerability is CVE-2026-8858. The attack needs to be done within the local network. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in IBM i up to 1.8.4/7.3.0/7.4.0/7.5.0. Affected by this vulnerability is an unknown functionality. The manipulation with an unknown input leads to a code injection vulnerability. The CWE definition for the vulnerability is CWE-94. The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at ibm.com. This vulnerability is known as CVE-2026-8858 since 05/18/2026. The exploitation appears to be difficult. The attack can only be done within the local network. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 06/22/2026). MITRE ATT&CK project uses the attack technique T1059 for this issue.

Upgrading eliminates this vulnerability.

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

• IBM

Name

• i

Version

• 1.8.0
• 1.8.1
• 1.8.2
• 1.8.3
• 1.8.4
• 7.0
• 7.1
• 7.2
• 7.3
• 7.3.0
• 7.4
• 7.4.0
• 7.5.0

License

• commercial

Website

• Vendor: https://www.ibm.com/

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