CVE-2026-18215
Medium
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.
SeverityMedium
CVSS6.8
Exploit probability—
Product
Redhat Build Of Keycloak
PublishedJul 31, 2026
First seenJul 31, 2026
Weakness typeCWE-287Improper authentication
How to fix
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| redhat build_of_keycloak | No range specified | — |
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