Vulnerability Details CVE-2026-18215
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 8.5%
CVSS Severity
CVSS v3 Score 6.8
References
Products affected by CVE-2026-18215
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cpe:2.3:a:redhat:build_of_keycloak:-