EUVD-2026-53716

A flaw was found in the SAML broker component of Keycloak, an identity and access management solution. When configured as a SAML broker using the IdP-Initiated flow, Keycloak fails to enforce the OneTimeUse condition in SAML assertions. This allows an attacker who captures a valid, unused asserti...

CVE-2026-18967

The CVE affects Keycloak’s SAML broker component when configured as an IdP-Initiated flow. The vulnerability arises because OneTimeUse in SAML assertions is not enforced, allowing an attacker who captures a valid, unused assertion to replay it and potentially hijack a user’s session, granting una...

CVE-2026-18967 Keycloak-services: keycloak-services: saml onetimeuse assertion replay in idp-initiated broker flow

A flaw was found in the SAML broker component of Keycloak, an identity and access management solution. When configured as a SAML broker using the IdP-Initiated flow, Keycloak fails to enforce the OneTimeUse condition in SAML assertions. This allows an attacker who captures a valid, unused asserti...