CVE-2021-4133

HIGH8.8EPSS 0.43%

Improper Authorization in Keycloak

Published: 1/6/2022Modified: 3/13/2026

Description

A incorrect authorization flaw was found in Keycloak 12.0.0, the flaw allows an attacker with any existing user account to create new default user accounts via the administrative REST API even where new user registration is disabled.

Affected packages (1)

Maven/org.keycloak:keycloak-servicesfrom 0, < 15.1.1

CVSS scores

Source	Version	Severity	Vector
osv	CVSS 3.1	HIGH8.8	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References (6)

ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2021-4133
PATCHhttps://github.com/keycloak/keycloak
WEBhttps://bugzilla.redhat.com/show_bug.cgi?id=2033602
WEBhttps://github.com/keycloak/keycloak/issues/9247
WEBhttps://github.com/keycloak/keycloak/security/advisories/GHSA-83x4-9cwr-5487
WEBhttps://www.oracle.com/security-alerts/cpuapr2022.html