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    CVE-2026-95503

    A flaw was found in the Kerberos federation provider of Keycloak, an open-source identity and access management solution. When Kerberos password authentication is used without SPNEGO, the system fails to verify the identity of the Key Distribution Center (KDC) by requesting a server ticket. This allows an attacker on the same network to spoof the KDC and bypass the authentication process, potentially gaining unauthorized access to user accounts.

    Published:Sep 22, 2026
    Last Modified:Nov 6, 2026
    EPS:Sep 22, 2026
    EPSS Score:0.00192
    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 Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-463 Padding Oracle Crypto Attack
    CAPEC-475 Signature Spoofing by Improper Validation

    Related CVEs

    CVE-2026-120984 (CVSS 9.1) — A flaw was found in the Keycloak server's client management component. When a client is created or imported wi…
    CVE-2026-9797 (CVSS 6.5) — A flaw was found in Keycloak's administrative services (org.keycloak.services.resources.admin). A highly privi…
    CVE-2026-110932 (CVSS 7.5) — A flaw was found in the theme resource endpoint of Keycloak, an open-source identity and access management sol…
    CVE-2026-107912 (CVSS 7.7) — A flaw was found in the management interface of the Quarkus framework, specifically within the quarkus-vertx-h…
    CVE-2026-110931 (CVSS 7.5) — A flaw was found in the SAML 1.1 assertion parser of Keycloak, a tool used for identity and access management.…
    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-2026-96547 (CVSS 6.5) — A flaw was found in the Dynamic Client Registration component of Keycloak, an open-source identity and access …
    CVE-2026-97367 (CVSS 6.4) — A flaw was found in the Keycloak Account REST API where it incorrectly handles session identification. A malic…
    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-2026-96447 (CVSS 4.2) — A flaw was found in the TokenManager component of Keycloak, an open-source identity and access management solu…

    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