What is CVE-2026-18215?

CVE-2026-18215 is a medium-severity vulnerability in Red Hat Build Of Keycloak, classified under Improper Authentication. CVSS score: 6.8/10. Published 2026-07-31.

How severe is CVE-2026-18215?

Medium severity. CVSS v3 base score is 6.8 out of 10.

Auth bypass in Red Hat Build Of Keycloak

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…

Vulnerability class: Broken Authentication

CVSS v3 metric

CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N.

Affected products

Red Hat Build Of Keycloak
Red Hat Data Grid 8
Red Hat Jboss Enterprise Application Platform Expansion Pack
Red Hat Single Sign-on 7

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

secalert@redhat.com (x_refsource_REDHAT, vdb-entry)
secalert@redhat.com (x_refsource_REDHAT, issue-tracking)

Frequently asked questions

What is CVE-2026-18215?: CVE-2026-18215 is a medium-severity vulnerability in Red Hat Build Of Keycloak, classified under Improper Authentication. CVSS score: 6.8/10. Published 2026-07-31.
How severe is CVE-2026-18215?: Medium severity. CVSS v3 base score is 6.8 out of 10.