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    CVE-2026-103884

    A flaw was found in the X.509 client certificate authenticator of Keycloak. When CRL Distribution Point checking is enabled, the server fails to properly validate the file paths provided in a client certificate. An attacker can provide a specially crafted certificate that causes the server to attempt to read sensitive files from the local system or exhaust memory by loading extremely large files, potentially leading to information disclosure or a system crash.

    Published:Sep 30, 2026
    Last Modified:Oct 1, 2026
    EPS:Oct 1, 2026
    EPSS Score:
    CVSS Score:6.5

    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

    Related CVEs

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    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…
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    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