CVE-2026-16442
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Red Hat | Red Hat build of Keycloak 26.4 | 26.4.14-1 < * | unaffected |
| Red Hat | Red Hat build of Keycloak 26.4 | 26.4-22 < * | unaffected |
| Red Hat | Red Hat build of Keycloak 26.4 | 26.4-22 < * | unaffected |
| Red Hat | Red Hat build of Keycloak 26.6 | 26.6.5-1 < * | unaffected |
| Red Hat | Red Hat build of Keycloak 26.6 | 26.6-11 < * | unaffected |
| Red Hat | Red Hat build of Keycloak 26.6 | 26.6-11 < * | unaffected |
Weaknesses
- CWE-346: Origin Validation Error
Workarounds
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: no
- Technical Impact: partial
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
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