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    CVE-2026-19607

    A flaw was found in the first-broker-login flow of the keycloak-services component. This component handles the initial authentication and account linking when a user logs in via an external identity provider. The issue allows an attacker to register a matching username on an external provider to trigger a collision in Keycloak, which results in the legitimate user being locked out of their account.

    Published:Sep 16, 2026
    Last Modified:Sep 19, 2026
    EPS:Sep 16, 2026
    EPSS Score:0.00507
    CVSS Score:5.3

    Affected Products

    Vendor
    Redhat
    Product
    Build Keycloak
    Vendor
    Redhat
    Product
    Build Of Keycloak
    Vendor
    Redhat
    Product
    Red Hat Single Sign On

    Exploits

    https://github.com/7Ragnarok7/CVE-2026-19607

    Common Weakness Enumeration

    CWE-287 Improper Authentication

    Related CVEs

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    CVE-2026-97174 (CVSS 6.8) — A flaw was found in the Client-Initiated Backchannel Authentication (CIBA) implementation of Keycloak. The CIB…
    CVE-2026-96453 (CVSS 8) — A flaw was found in the Keycloak Admin CLI kcadm tool, which is used by administrators to manage Keycloak serv…
    CVE-2026-93998 (CVSS 7.4) — A flaw was found in the SAML adapter component of Keycloak, which is used to secure applications with SAML-bas…
    CVE-2026-92857 (CVSS 8.1) — Keycloak provides a Dynamic Client Registration feature that allows users with specific tokens to register the…
    CVE-2026-92855 (CVSS 7.4) — A flaw was found in the SAML identity broker component of Keycloak, which is used to delegate authentication t…
    CVE-2026-82965 (CVSS 7.5) — A flaw was found in the SAML implementation of Keycloak, an open-source identity and access management solutio…
    CVE-2026-114232 (CVSS 8.1) — A flaw was found in the UserManagedPermissionService of the Keycloak authorization server. The UMA Protection …
    CVE-2026-112208 (CVSS 8.1) — A flaw was found in the Organization identity-first login flow of the Keycloak authentication server. Keycloak…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High