Vulnerability Details 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 8.8%
CVSS Severity
CVSS v3 Score 7.4
References
- https://access.redhat.com/errata/RHSA-2026:50846
- https://access.redhat.com/errata/RHSA-2026:50847
- https://access.redhat.com/errata/RHSA-2026:50848
- https://access.redhat.com/errata/RHSA-2026:50849
- https://access.redhat.com/security/cve/CVE-2026-16442
- https://bugzilla.redhat.com/show_bug.cgi?id=2503138
Products affected by CVE-2026-16442
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cpe:2.3:a:redhat:build_of_keycloak:26.4
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cpe:2.3:a:redhat:build_of_keycloak:26.4.10
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cpe:2.3:a:redhat:build_of_keycloak:26.4.11
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cpe:2.3:a:redhat:build_of_keycloak:26.4.12
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cpe:2.3:a:redhat:build_of_keycloak:26.4.13
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cpe:2.3:a:redhat:build_of_keycloak:26.4.4
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cpe:2.3:a:redhat:build_of_keycloak:26.4.5
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cpe:2.3:a:redhat:build_of_keycloak:26.4.6
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cpe:2.3:a:redhat:build_of_keycloak:26.4.7
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cpe:2.3:a:redhat:build_of_keycloak:26.4.8
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cpe:2.3:a:redhat:build_of_keycloak:26.4.9
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cpe:2.3:a:redhat:build_of_keycloak:26.6
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cpe:2.3:a:redhat:build_of_keycloak:26.6.3
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cpe:2.3:a:redhat:build_of_keycloak:26.6.4