What is CVE-2026-4366?

CVE-2026-4366 is a medium-severity vulnerability in Red Hat Build Of Keycloak, classified under Server-Side Request Forgery (SSRF). CVSS score: 5.8/10. Published 2026-03-18.

How severe is CVE-2026-4366?

Medium severity. CVSS v3 base score is 5.8 out of 10.

SSRF in Red Hat Build Of Keycloak

CVE-2026-4366

A flaw was identified in Keycloak, an identity and access management solution, where it improperly follows HTTP redirects when processing certain client configuration requests. This behavior allows an attacker to trick the server into maki…

Vulnerability class: SSRF (Server-Side Request Forgery)

EPSS: 0.000 (11.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N.

Affected products

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

References

access.redhat.com/security/cve/CVE-2026-4366 (vdb-entry, x_refsource_REDHAT)
RHBZ#2448543 (issue-tracking, x_refsource_REDHAT)

Frequently asked questions

What is CVE-2026-4366?: CVE-2026-4366 is a medium-severity vulnerability in Red Hat Build Of Keycloak, classified under Server-Side Request Forgery (SSRF). CVSS score: 5.8/10. Published 2026-03-18.
How severe is CVE-2026-4366?: Medium severity. CVSS v3 base score is 5.8 out of 10.