CVE-2026-4633

LOW

Keycloak: keycloak: user enumeration via differential error messages

Title source: cna

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.

References (2)

Core 2

Core References

Vdb Entry, X_Refsource_Redhat vdb-entry x_refsource_redhat

https://access.redhat.com/security/cve/CVE-2026-4633

Issue Tracking, X_Refsource_Redhat issue-tracking x_refsource_redhat

RHBZ#2450247

https://bugzilla.redhat.com/show_bug.cgi?id=2450247

Scores

CVSS v3 3.7

EPSS 0.0032

EPSS Percentile 23.3%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-209

Status published

Products (3)

org.keycloak/keycloak-services 0Maven

Red Hat/Red Hat Build of Keycloak

redhat/build_of_keycloak

Published Mar 23, 2026

Tracked Since Mar 23, 2026