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Medium severity · published Apr 22, 2026
CVE-2026-3621
IBM WebSphere Application Server Liberty is affected by identity spoofing
5.9
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
None
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 20% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
WA
WebSphere Application Server - Liberty · IBM
17.0.0.3 through 26.0.0.4 · source: vendor
WA
Websphere Application Server · Ibm
17.0.0.3 before 26.0.0.5 · source: NVD
Affected product
WA
WebSphere Application Server - Liberty
IBM
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-3621
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-3621
Vendor Advisory
https://www.ibm.com/support/pages/node/7270437
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