CVE-2026-18215

HighCVSS 8.1/10Last modified Sep 16, 2026

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.

Metrics

CVSS 3.1 8.1/10CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Weakness enumeration

CWE-287

Affected software

No affected versions have been published.

Timeline

Published: Jul 31, 2026
Last modified: Sep 16, 2026
NVD status: Modified

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