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    CVE-2026-109082

    A flaw was found in the Client-Initiated Backchannel Authentication CIBA implementation within the keycloak-services component of Keycloak. This component handles advanced authentication flows where a client initiates a login on behalf of a user. The issue occurs because Keycloak fails to verify that a client is authorized to use the CIBA flow, allowing public clients to bypass security requirements. An attacker could use this flaw to trick a user into approving a login request, eventually gaining full access to the users account without needing a client secret.

    Published:Oct 9, 2026
    Last Modified:Oct 15, 2026
    EPS:Oct 12, 2026
    EPSS Score:0.00248
    CVSS Score:6.8

    Affected Products

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

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-287 Improper Authentication

    Related CVEs

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    CVE-2026-117627 (CVSS 5.4) — A flaw was found in the JWT Authorization Grant implementation of the keycloak-services component. When an OID…
    CVE-2026-117859 (CVSS 5.4) — A flaw was found in the Pushed Authorization Request PAR implementation of the keycloak-services component. Th…
    CVE-2026-118030 (CVSS 4.2) — A flaw was found in the HOTP authentication mechanism of the keycloak-services component, which provides ident…
    CVE-2026-114438 (CVSS 4.2) — A flaw was found in the Update User Locale required action of the Keycloak identity and access management solu…
    CVE-2026-107889 (CVSS 5.5) — A flaw was found in the login theme rendering component of Keycloak. The issue occurs because the security fil…
    CVE-2026-107604 (CVSS 4.9) — A flaw was found in the installation provider and client registration endpoints of the Keycloak identity manag…
    CVE-2026-107623 (CVSS 4.3) — A flaw was found in the OIDC Dynamic Client Registration (DCR) component of Keycloak. A bug in the response se…
    CVE-2026-107121 (CVSS 6.5) — A flaw was found in the SMTP email configuration handling of the keycloak-services component. When the STARTTL…

    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