What is CVE-2026-8400?

CVE-2026-8400 is a high-severity vulnerability in Ibm Websphere Application Server, classified under Use of Externally-Controlled Input to Select Classes or Code (Unsafe Reflection). CVSS score: 8.1/10. Published 2026-08-05.

How severe is CVE-2026-8400?

High severity. CVSS v3 base score is 8.1 out of 10.

Vulnerability in Ibm Websphere Application Server

CVE-2026-8400

IBM WebSphere Application Server 8.5, and 9.0 and IBM WebSphere Application Server - Liberty Continuous delivery has a flaw in the ORB component in IBM SDK, Java Technology Edition, may allow a malicious IIOP server to induce loading and i…

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Ibm Websphere Application Server — versions 8.5, 9.0
Ibm Websphere Application Server - Liberty — versions Continuous delivery

Weakness classification (CWE)

CWE-470 — Use of Externally-Controlled Input to Select Classes or Code (Unsafe Reflection)

References

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

Frequently asked questions

What is CVE-2026-8400?: CVE-2026-8400 is a high-severity vulnerability in Ibm Websphere Application Server, classified under Use of Externally-Controlled Input to Select Classes or Code (Unsafe Reflection). CVSS score: 8.1/10. Published 2026-08-05.
How severe is CVE-2026-8400?: High severity. CVSS v3 base score is 8.1 out of 10.