What is CVE-2026-16089?

CVE-2026-16089 is a medium-severity vulnerability in Red Hat Build Of Keycloak, classified under CWE-472. CVSS score: 5.4/10. Published 2026-07-17.

How severe is CVE-2026-16089?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Vulnerability in Red Hat Build Of Keycloak

CVE-2026-16089

A flaw was found in the keycloak-services component of Red Hat Build of Keycloak. The issue occurs because OAuth 2.0 authorization codes are not properly bound to the client that originally requested them. An attacker who can intercept an authorization code can modify it to be redeemed by their own client, potentially allowing them to obtain access tokens for a victim's identity.

EPSS: 0.001 (3.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:L/A:N.

Affected products

Weakness classification (CWE)

References

secalert@redhat.com (x_refsource_REDHAT, vdb-entry, Vendor Advisory)
secalert@redhat.com (x_refsource_REDHAT, issue-tracking, Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2026-16089?: CVE-2026-16089 is a medium-severity vulnerability in Red Hat Build Of Keycloak, classified under CWE-472. CVSS score: 5.4/10. Published 2026-07-17.
How severe is CVE-2026-16089?: Medium severity. CVSS v3 base score is 5.4 out of 10.