What is CVE-2026-107623?

CVE-2026-107623 is a medium-severity vulnerability in Red Hat Build Of Keycloak, classified under Missing Authorization. CVSS score: 4.3/10. Published 2026-10-08.

How severe is CVE-2026-107623?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Auth bypass in Red Hat Build Of Keycloak

CVE-2026-107623

A flaw was found in the OIDC Dynamic Client Registration (DCR) component of Keycloak. A bug in the response serialization causes the backchannel logout offline token revocation setting to be omitted from responses. When a client performs a standard update, this missing information causes the setting to be silently disabled. As a result, offline tokens may remain valid even after a user session is terminated via backchannel logout.

Vulnerability class: Broken Access Control

Published 2026-10-08 · last modified 2026-10-08.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Red Hat Build Of Keycloak

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

access.redhat.com/security/cve/CVE-2026-107623 (vdb-entry)
bugzilla.redhat.com/show_bug.cgi (issue-tracking)

Frequently asked questions

What is CVE-2026-107623?: CVE-2026-107623 is a medium-severity vulnerability in Red Hat Build Of Keycloak, classified under Missing Authorization. CVSS score: 4.3/10. Published 2026-10-08.
How severe is CVE-2026-107623?: Medium severity. CVSS v3 base score is 4.3 out of 10.