CVE-2026-3621 IBM WebSphere Application Server Liberty is affected by identity spoofing

What is CVE-2026-3621?

CVE-2026-3621 is a high-severity authentication bypass vulnerability in Ibm Websphere Application Server, published on 22 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.4 IBM WebSphere Application Server Liberty is vulnerable to identity spoofing under limited conditions when an application is deployed without authentication and authorization configured.

Weakness: CWE-269

Which versions are affected by CVE-2026-3621?

It affects 1 product.

Products include Ibm Websphere Application Server.

How do I fix CVE-2026-3621?

No fix has been published for CVE-2026-3621 yet. Limit exposure of the affected software until one is available.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2026-3621 being exploited?

There is no known exploitation of CVE-2026-3621 in the wild and no public exploit code.

Other vulnerabilities in Ibm Websphere Application Server

• CVE-2015-1920 Code injection in n/a Critical 10.0
• CVE-2013-0462 Other in n/a Critical 10.0
• CVE-2011-1377 Security feature bypass in n/a Critical 10.0
• CVE-2010-3186 Other in n/a Critical 10.0
• CVE-2009-1899 Information disclosure in n/a Critical 10.0

All Ibm Websphere Application Server vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-r6x6-g36w-q7qm.