What is CVE-2026-11711?

CVE-2026-11711 is a medium-severity vulnerability in IBM Websphere Application Server, classified under Deserialization of Untrusted Data. CVSS score: 6.5/10. Published 2026-09-18.

How severe is CVE-2026-11711?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Deserialization in IBM Websphere Application Server

CVE-2026-11711

IBM WebSphere Application Server 9.0 and 8.5 is affected by a deserialization vulnerability in the Name Service component.

Vulnerability class: Insecure Deserialization

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Ibm Websphere Application Server — versions 8.5, 9.0

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

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

Frequently asked questions

What is CVE-2026-11711?: CVE-2026-11711 is a medium-severity vulnerability in IBM Websphere Application Server, classified under Deserialization of Untrusted Data. CVSS score: 6.5/10. Published 2026-09-18.
How severe is CVE-2026-11711?: Medium severity. CVSS v3 base score is 6.5 out of 10.