CVE-2020-4589: IBM WebSphere Application Server

Critical severity, CVSS 9.8. EPSS: 8.5% chance of exploitation in the next 30 days.

IBM WebSphere Application Server 7.0, 8.0, 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: 184585.

Affected products

• IBM WebSphere Application Server: from 7.0.0.0, up to and including 7.0.0.45; from 8.0.0.0, up to and including 8.0.0.15; from 8.5.0.0, up to and including 8.5.5.17; from 9.0.0.0, up to and including 9.0.5.4

Published 2020-08-13. Last modified 2026-06-17.