CVE-2026-16442
Keycloak-services: keycloak-services: saml idp-initiated broker login bypasses link-only restriction
CVSS Score
7.4
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-346 |
| Vendor | red hat |
| Product | red hat build of keycloak 26.4 |
| Published | Aug 5, 2026 |
| Last Updated | Aug 5, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None
Affected Versions
Red Hat / Red Hat build of Keycloak 26.4
All versions affected Red Hat / Red Hat build of Keycloak 26.4
All versions affected Red Hat / Red Hat build of Keycloak 26.4
All versions affected Red Hat / Red Hat build of Keycloak 26.4.14
All versions affected Red Hat / Red Hat build of Keycloak 26.4.14
All versions affected Red Hat / Red Hat build of Keycloak 26.6
All versions affected Red Hat / Red Hat build of Keycloak 26.6
All versions affected Red Hat / Red Hat build of Keycloak 26.6
All versions affected Red Hat / Red Hat build of Keycloak 26.6.5
All versions affected Red Hat / Red Hat build of Keycloak 26.6.5
All versions affected Red Hat / Red Hat build of Keycloak 26.6.5
All versions affected Red Hat / Red Hat Data Grid 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform Expansion Pack
All versions affected Red Hat / Red Hat Single Sign-On 7
All versions affected References
access.redhat.com: https://access.redhat.com/errata/RHSA-2026:50846 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:50847 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:50848 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:50849 access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-16442 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2503138
Credits
Red Hat would like to thank Paul Bottinelli (Trail of Bits) for reporting this issue.