CVE-2026-18215
MEDIUM
NVD
CVSS Score
6.8
Severity
MEDIUM
Published
Jul 31, 2026
Vendor
unknown
Description
Keycloak provides a way to let users log in using Microsoft accounts while restricting access to a specific organization (tenant). A flaw was discovered where this restriction is ignored when using the token exchange feature. This means an attacker with a valid Microsoft token from a completely different organization could gain access to the Keycloak realm, potentially accessing sensitive data or performing unauthorized actions.