Keycloak: Unauthorized authentication via disabled SAML Identity Provider
A flaw was found in Keycloak. A remote attacker could bypass security controls by sending a valid SAML response from an external Identity Provider (IdP) to the Keycloak SAML endpoint for IdP-initiated broker logins. This allows the attacker to complete broker logins even when the SAML Identity Provider is disabled, leading to unauthorized authentication.
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-2603US | —OT elevated | — | ||
A flaw was found in Keycloak. A remote attacker could bypass security controls by sending a valid SAML response from an external Identity Provider (IdP) to the Keycloak SAML endpoi… | ||||
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references
External citations — patches, advisories, analysis.
- https://access.redhat.com/errata/RHSA-2026:3925WEB
- https://access.redhat.com/errata/RHSA-2026:3926WEB
- https://access.redhat.com/errata/RHSA-2026:3947WEB
- https://access.redhat.com/errata/RHSA-2026:3948WEB
- https://access.redhat.com/security/cve/CVE-2026-2603WEB
- https://bugzilla.redhat.com/show_bug.cgi?id=2440300WEB
- https://github.com/keycloak/keycloakPACKAGE
- https://github.com/keycloak/keycloak/commit/4fd5367e6cc28cfa68fb2240fc459c12b1fdbf2aWEB
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