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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.

PUBLISHED Reserved 2026-03-18 | Published 2026-03-18 | Updated 2026-03-18 | Assigner redhat




MEDIUM: 5.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N

Problem types

Server-Side Request Forgery (SSRF)

Product status

Default status
affected

Default status
affected

Default status
affected

Default status
affected

Default status
affected

Default status
affected

Timeline

2026-03-18:Reported to Red Hat.
2026-03-18:Made public.

Credits

Red Hat would like to thank Georgije Vukov (Elite Security Systems) for reporting this issue.

References

access.redhat.com/security/cve/CVE-2026-4366 vdb-entry

bugzilla.redhat.com/show_bug.cgi?id=2448543 (RHBZ#2448543) issue-tracking

cve.org (CVE-2026-4366)

nvd.nist.gov (CVE-2026-4366)

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