A flaw was found in the SAML brokering component of Keycloak, an identity and access management solution. The issue occurs when Keycloak acts as an intermediary between an upstream identity provider and downstream services. Keycloak fails to respect specific security instructions called ProxyRestrictions in the login messages it receives. This allows a user to log into downstream services even when the original identity provider explicitly forbade further sharing of the login session. As a result, users can bypass security boundaries intended to limit where their identity can be used.

A flaw was found in the SAML brokering component of Keycloak, an identity and access management solution. The issue occurs when Keycloak acts as an intermediary between an upstream identity provider and downstream services. Keycloak fails to respect specific security instructions called ProxyRestrictions in the login messages it receives. This allows a user to log into downstream services even when the original identity provider explicitly forbade further sharing of the login session. As a result, users can bypass security boundaries intended to limit where their identity can be used.

org.bouncycastle/bcprov-jdk15on: org.bouncycastle/bcpkix-jdk15on: Bouncy Castle for Java: Name Constraints bypass via trailing dot in rfc822Name and URI keycloak-broker: Keycloak: Privilege escalation to realm administrator via improper authorization in identity provider mapper org.bouncycastle/bc-java: org.bouncycastle/bc-lts-java: Bouncy Castle for Java: Cryptographic signature bypass in RSA PKCS#1 verification bouncycastle: Bouncy Castle for Java: Denial of Service via lazy ASN.1 sequence processing keycloak-services: keycloak-services: OIDC IdP update reuses masked client secret after token URL change keycloak-services: keycloak-services: Incomplete fix for CIBA brute-force lockout bypass at token redemption keycloak-services: keycloak-services: Group policy extendChildren matches sibling group path prefixes keycloak-services: keycloak-services: Client policy source-host wildcard domain matching bypass keycloak-services: keycloak-services: Client policy source-group condition bypass via duplicate group name matching keycloak-services: keycloak-services: Inactive out-of-audience token introspection leaks signed JWT claim keycloak-services: keycloak-services: SAML HTTP-Redirect binding response preserves query string leading to parameter pollution keycloak-services: keycloak-services: OIDC backchannel logout accepts unsigned forged logout tokens keycloak-services: keycloak-services: Name-only group claims let same-name groups satisfy path-specific group policies wildfly-el…