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Description

A flaw was found in Keycloak. A remote attacker can exploit differential error messages during the identity-first login flow when Organizations are enabled. This vulnerability allows an attacker to determine the existence of users, leading to information disclosure through user enumeration.

PUBLISHED Reserved 2026-03-23 | Published 2026-03-23 | Updated 2026-04-01 | Assigner redhat




LOW: 3.7CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

Problem types

Generation of Error Message Containing Sensitive Information

Product status

Default status
affected

Timeline

2026-03-23:Reported to Red Hat.
2025-03-23:Made public.

References

access.redhat.com/security/cve/CVE-2026-4633 vdb-entry

bugzilla.redhat.com/show_bug.cgi?id=2450247 (RHBZ#2450247) issue-tracking

cve.org (CVE-2026-4633)

nvd.nist.gov (CVE-2026-4633)

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