CVE-2020-4421

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-05-06 · updated 2026-06-17
Weakness: CWE-290

Description

IBM WebSphere Application Liberty 19.0.0.5 through 20.0.0.4 could allow an authenticated user using openidconnect to spoof another users identify. IBM X-Force ID: 180084.

Affected products

IBM WebSphere Application Server: from 19.0.0.5 before 20.0.0.5 — fixed in 20.0.0.5

How to fix

Upgrade to a fixed version: IBM WebSphere Application Server 20.0.0.5. Check the vendor advisory for mitigations.

References

https://exchange.xforce.ibmcloud.com/vulnerabilities/180084
https://www.ibm.com/support/pages/node/6205926
https://exchange.xforce.ibmcloud.com/vulnerabilities/180084
https://www.ibm.com/support/pages/node/6205926

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