Vulnerability in Red Hat Build Of Keycloak
CVE-2026-16442
A flaw was found in the SAML broker component of Keycloak, which is used to manage identity federation and user authentication. The issue occurs because the IdP-initiated Single Sign-On endpoint fails to check if a provider is restricted to account linking only. This allows an attacker with control over a linked upstream identity to bypass login restrictions and gain full access to a local user account.
EPSS: 0.002 (10.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N.
Affected products
- Red Hat Build Of Keycloak
- Red Hat Build Of Keycloak 26.4 — versions 26.4-22, 26.4.14-1
- Red Hat Build Of Keycloak 26.4.14
- Red Hat Build Of Keycloak 26.6 — versions 26.6-11, 26.6.5-1
- Red Hat Build Of Keycloak 26.6.5
- Red Hat Data Grid 8
- Red Hat Jboss Enterprise Application Platform Expansion Pack
- Red Hat Single Sign-on 7
- Redhat Build_of_keycloak
Weakness classification (CWE)
References
- secalert@redhat.com (x_refsource_REDHAT, vdb-entry, Vendor Advisory)
- RHBZ#2503138 (x_refsource_REDHAT, issue-tracking, Issue Tracking, Vendor Advisory)
- RHSA-2026:50846 (x_refsource_REDHAT, vendor-advisory, Vendor Advisory)
- RHSA-2026:50847 (x_refsource_REDHAT, vendor-advisory, Vendor Advisory)
- RHSA-2026:50848 (x_refsource_REDHAT, vendor-advisory, Vendor Advisory)
- RHSA-2026:50849 (x_refsource_REDHAT, vendor-advisory, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-16442?
- CVE-2026-16442 is a high-severity vulnerability in Red Hat Build Of Keycloak, classified under Origin Validation Error. CVSS score: 7.4/10. Published 2026-08-05.
- How severe is CVE-2026-16442?
- High severity. CVSS v3 base score is 7.4 out of 10.