What is CVE-2026-18218?

CVE-2026-18218 is a medium-severity vulnerability in Red Hat Build Of Keycloak, classified under Missing Authorization. CVSS score: 4.2/10. Published 2026-07-31.

How severe is CVE-2026-18218?

Medium severity. CVSS v3 base score is 4.2 out of 10.

Auth bypass in Red Hat Build Of Keycloak

CVE-2026-18218

A flaw was found in the TokenManager component of the Keycloak identity management service. When an administrator attempts to revoke tokens for a specific application (client) using a "not-before" policy, the revocation may be silently ign…

Vulnerability class: Broken Access Control

CVSS v3 metric

CVSS v3 base score 4.2 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/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-862 — Missing Authorization

References

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

Frequently asked questions

What is CVE-2026-18218?: CVE-2026-18218 is a medium-severity vulnerability in Red Hat Build Of Keycloak, classified under Missing Authorization. CVSS score: 4.2/10. Published 2026-07-31.
How severe is CVE-2026-18218?: Medium severity. CVSS v3 base score is 4.2 out of 10.