CVE-2026-2603

HIGH

Keycloak: keycloak: unauthorized authentication via disabled saml identity provider

Title source: cna

Description

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.

References (6)

[Vendor Advisory] https://access.redhat.com/errata/RHSA-2026:3925

[Vendor Advisory] https://access.redhat.com/errata/RHSA-2026:3926

[Vendor Advisory] https://access.redhat.com/errata/RHSA-2026:3947

[Vendor Advisory] https://access.redhat.com/errata/RHSA-2026:3948

[Vdb Entry, X_Refsource_Redhat] https://access.redhat.com/security/cve/CVE-2026-2603

[Issue Tracking, X_Refsource_Redhat] https://bugzilla.redhat.com/show_bug.cgi?id=2440300

Scores

CVSS v3 8.1

EPSS 0.0026

EPSS Percentile 49.5%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Details

CWE

CWE-306

Status published

Products (8)

org.keycloak/keycloak-server-spi-private 0Maven

org.keycloak/keycloak-services 0Maven

Red Hat/Red Hat build of Keycloak 26.2 26.2.14-1

Red Hat/Red Hat build of Keycloak 26.2 26.2-16

Red Hat/Red Hat build of Keycloak 26.2.14

Red Hat/Red Hat build of Keycloak 26.4 26.4.10-1

Red Hat/Red Hat build of Keycloak 26.4 26.4-12

Red Hat/Red Hat build of Keycloak 26.4.10

Published Mar 18, 2026

Tracked Since Mar 18, 2026