CVE-2019-4279: IBM WebSphere Application Server

Critical severity, CVSS 9.8. EPSS: 79.9% chance of exploitation in the next 30 days.

IBM WebSphere Application Server 8.5 and 9.0 could allow a remote attacker to execute arbitrary code on the system with a specially-crafted sequence of serialized objects from untrusted sources. IBM X-Force ID: 160445.

Affected products

• IBM WebSphere Application Server: from 8.5.0.0, up to and including 8.5.5.15; from 9.0.0.0, up to and including 9.0.0.11; version 7.0.0.0 only

Published 2019-05-17. Last modified 2026-06-17.