How severe is CVE-2026-3621?

CVE-2026-3621 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-3621 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-3621?

CVE-2026-3621 affects Ibm Websphere Application Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-3621?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-3621 have an EU (EUVD) identifier?

Yes. CVE-2026-3621 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-25131.

When was CVE-2026-3621 published?

CVE-2026-3621 was published on 2026-04-23 and last updated on 2026-06-17.

CVE-2026-3621

CVE-2026-3621 is a high-severity vulnerability in Ibm Websphere Application Server with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-269.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (19th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-25131
Weakness: CWE-269
Affected product: Ibm Websphere Application Server
Published: 2026-04-23
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-3621?: 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.
How severe is CVE-2026-3621?: CVE-2026-3621 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-3621 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-3621?: CVE-2026-3621 affects Ibm Websphere Application Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-3621?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-3621 have an EU (EUVD) identifier?: Yes. CVE-2026-3621 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-25131.
When was CVE-2026-3621 published?: CVE-2026-3621 was published on 2026-04-23 and last updated on 2026-06-17.

References

https://www.ibm.com/support/pages/node/7270437

Affected products (1)

cpe:2.3:a:ibm:websphere_application_server:*:*:*:*:liberty:*:*:*

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