by Kastro CVE-2026-16443
Red Hat Red Hat build of Keycloak 26.4 — Keycloak-services: keycloak-services: saml broker metadata import disables response signature validation
Description · from the CVE record
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.
Affected
ProductAffectedFixed inSource
Red Hat build of Keycloak 26.4see advisory26.4.14-1CNA
Red Hat build of Keycloak 26.4see advisory26.4-22CNA
Red Hat build of Keycloak 26.4see advisory26.4-22CNA
Red Hat build of Keycloak 26.4.14see advisory–CNA
Red Hat build of Keycloak 26.4.14see advisory–CNA
Red Hat build of Keycloak 26.6see advisory26.6.5-1CNA
Red Hat build of Keycloak 26.6see advisory26.6-11CNA
Red Hat build of Keycloak 26.6see advisory26.6-11CNA
Red Hat build of Keycloak 26.6.5see advisory–CNA
Red Hat build of Keycloak 26.6.5see advisory–CNA
Red Hat build of Keycloak 26.6.5see advisory–CNA
Red Hat Data Grid 8see advisory–CNA
Scores by source
NVD9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
redhat (CNA)7.4CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total