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.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.003 (24.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 24th percentile — 24.3% 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
- 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
- Red Hat Build Of Keycloak
Weakness classification (CWE)
References
- access.redhat.com/security/cve/CVE-2026-16442 (vdb-entry, Vendor Advisory)
- RHBZ#2503138 (issue-tracking, Issue Tracking, Vendor Advisory)
- RHSA-2026:50846 (vendor-advisory, Vendor Advisory)
- RHSA-2026:50847 (vendor-advisory, Vendor Advisory)
- RHSA-2026:50848 (vendor-advisory, Vendor Advisory)
- RHSA-2026:50849 (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.