Description
A flaw was found in the SAML metadata import functionality of the keycloak-services component, which is the core engine for identity brokering in Red Hat Build of Keycloak. When importing identity provider metadata that lacks specific usage attributes for keys, the system incorrectly disables signature validation for SAML responses even if a signing certificate is provided. This issue allows an unauthenticated attacker to forge a SAML response and gain unauthorized access to a user account by knowing their external identifier.
Metrics
CVSS 3.1 9.1/10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:NWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| Red Hat | Red Hat build of Keycloak 26.4 | — |
| Red Hat | Red Hat build of Keycloak 26.4 | — |
| Red Hat | Red Hat build of Keycloak 26.4 | — |
| Red Hat | Red Hat build of Keycloak 26.4.14 | — |
| Red Hat | Red Hat build of Keycloak 26.4.14 | — |
| Red Hat | Red Hat build of Keycloak 26.6 | — |
| Red Hat | Red Hat build of Keycloak 26.6 | — |
| Red Hat | Red Hat build of Keycloak 26.6 | — |
| Red Hat | Red Hat build of Keycloak 26.6.5 | — |
| Red Hat | Red Hat build of Keycloak 26.6.5 | — |
| Red Hat | Red Hat build of Keycloak 26.6.5 | — |
| Red Hat | Red Hat Data Grid 8 | — |
| Red Hat | Red Hat JBoss Enterprise Application Platform Expansion Pack | — |
| Red Hat | Red Hat Single Sign-On 7 | — |
References
- https://access.redhat.com/errata/RHSA-2026:50846Vendor Advisory
- https://access.redhat.com/errata/RHSA-2026:50847Vendor Advisory
- https://access.redhat.com/errata/RHSA-2026:50848Vendor Advisory
- https://access.redhat.com/errata/RHSA-2026:50849Vendor Advisory
- https://access.redhat.com/security/cve/CVE-2026-16443Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2503139Issue Tracking, Vendor Advisory
Timeline
- Published
- Aug 5, 2026
- Last modified
- Aug 10, 2026
- NVD status
- Analyzed