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.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.003 (21.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 21st percentile — 21.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
Weakness classification (CWE)
References
- access.redhat.com/security/cve/CVE-2026-16089 (vdb-entry, Vendor Advisory)
- bugzilla.redhat.com/show_bug.cgi (issue-tracking, Issue Tracking, Vendor Advisory)
- access.redhat.com/errata/RHSA-2026:68277 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:68278 (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.