VULNERABILITY INTELLIGENCE

CVE-2026-18215

CVSS score6.8 MEDIUM
EPSS probability0.40%
CISA KEVNot currently listed
Published2026-07-31
Last modified2026-09-16
CVSS vectorCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

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.

Weakness classification

  • secalert@redhat.com: CWE-287

Primary references