Keycloak-services: keycloak-services: saml idp-initiated broker login bypasses link-only restriction
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.
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-16442US | critical9.8 | — | ||
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 Si… | ||||
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references
External citations — patches, advisories, analysis.
- https://access.redhat.com/errata/RHSA-2026:50846ADVISORY
- https://access.redhat.com/errata/RHSA-2026:50847ADVISORY
- https://access.redhat.com/errata/RHSA-2026:50848ADVISORY
- https://access.redhat.com/errata/RHSA-2026:50849ADVISORY
- https://access.redhat.com/security/cve/CVE-2026-16442ADVISORY
- https://bugzilla.redhat.com/show_bug.cgi?id=2503138ADVISORY
- https://nvd.nist.gov/vuln/detail/CVE-2026-16442WEB
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