CVE-2026-4366 — MEDIUM (5.8)

Vulnerability Description

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 making unintended requests to internal or restricted resources. As a result, sensitive internal services such as cloud metadata endpoints could be accessed. This issue may lead to information disclosure and enable attackers to map internal network infrastructure.

CVSS Score

5.8

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

CHANGED

Confidentiality

LOW

Integrity

NONE

Availability

NONE

Affected Products

Vendor	Product	Versions
Redhat	Build Of Keycloak	-
Redhat	Jboss Enterprise Application Platform	8.0.0
Redhat	Jboss Enterprise Application Platform Expansion Pack	-
Redhat	Single Sign-On	7.0

Related Weaknesses (CWE)

CWE-918

References

https://access.redhat.com/security/cve/CVE-2026-4366Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2448543Issue TrackingVendor Advisory

FAQ

What is CVE-2026-4366?

CVE-2026-4366 is a vulnerability with a CVSS score of 5.8 (MEDIUM). 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...

How severe is CVE-2026-4366?

CVE-2026-4366 has been rated MEDIUM with a CVSS base score of 5.8/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-4366?

Check the references section above for vendor advisories and patch information. Affected products include: Redhat Build Of Keycloak, Redhat Jboss Enterprise Application Platform, Redhat Jboss Enterprise Application Platform Expansion Pack, Redhat Single Sign-On.