Advisoriesby IbisRed HatCVE-2026-16442
Red Hat SAML broker: origin validation error
No fix yet
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 versions
| Package | Affected | Fixed in |
|---|---|---|
| Red Hat Data Grid 8 Product | all versions | No fix yet |
| Red Hat build of Keycloak 26.4.14 Product | all versions | No fix yet |
| all versions | No fix yet | |
| Red Hat build of Keycloak 26.6.5 Product | all versions | No fix yet |
| all versions | No fix yet | |
| all versions | No fix yet |
Details and references
- CVSS 3.1
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
- Severity from
- the vendor (its own CVE record or advisory)
- Weakness
- CWE-346
- www.cve.org/CVERecord?id=CVE-2026-16442
- nvd.nist.gov/vuln/detail/CVE-2026-16442
- access.redhat.com/errata/RHSA-2026:50846
- access.redhat.com/errata/RHSA-2026:50847
- access.redhat.com/errata/RHSA-2026:50848
- access.redhat.com/errata/RHSA-2026:50849
- access.redhat.com/security/cve/CVE-2026-16442
- bugzilla.redhat.com/show_bug.cgi?id=2503138