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    CVE-2023-6544

    A flaw was found in the Keycloak package. This issue occurs due to a permissive regular expression hardcoded for filtering which allows hosts to register a dynamic client. A malicious user with enough information about the environment could jeopardize an environment with this specific Dynamic Client Registration and TrustedDomain configuration previously unauthorized.

    Published:Apr 16, 2024
    Last Modified:Apr 15, 2026
    EPS:Apr 25, 2024
    EPSS Score:0.01309
    CVSS Score:5.4

    Affected Products

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

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-625 Permissive Regular Expression

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-89298 (CVSS 4.9) — A flaw was found in the Dynamic Client Registration service of Keycloak, an open-source identity and access ma…
    CVE-2026-88770 (CVSS 6.5) — A flaw was found in the Device Authorization Grant flow of Keycloak, an identity and access management solutio…
    CVE-2026-19729 (CVSS 4.9) — A flaw was found in the key provider component of the keycloak-services library, which is the core engine for …
    CVE-2026-17615 (CVSS 7.5) — A flaw was found in RESTEasy's SourceProvider. This vulnerability allows an unauthenticated attacker to perfor…
    CVE-2026-82968 (CVSS 6.4) — A flaw was found in the first-broker-login flow of the Keycloak identity management service. When a user links…
    CVE-2026-19611 (CVSS 7.4) — A flaw was found in WildFly Elytron. Password hashing and verification normalize input with Unicode NFKC, whic…
    CVE-2026-15571 (CVSS 7.3) — A flaw was found in the legacy client-initiated account-linking endpoint of Keycloak, a widely used open-sourc…
    CVE-2026-79652 (CVSS 5.9) — A flaw was found in the JWT Bearer authorization grant implementation within the keycloak-services component o…
    CVE-2026-18963 (CVSS 9.1) — A flaw was found in the reset-credentials flow of the keycloak-services component, which is the core engine fo…
    CVE-2026-19608 (CVSS 5.3) — A flaw was found in the group policy provider of Keycloak authorization services, which is used to manage fine…

    References

    https://access.redhat.com/errata/RHSA-2024:1860
    https://access.redhat.com/errata/RHSA-2024:1861
    https://access.redhat.com/errata/RHSA-2024:1862
    https://access.redhat.com/errata/RHSA-2024:1864
    https://access.redhat.com/errata/RHSA-2024:1866
    https://access.redhat.com/errata/RHSA-2024:1867
    https://access.redhat.com/errata/RHSA-2024:1868
    https://access.redhat.com/security/cve/CVE-2023-6544
    https://bugzilla.redhat.com/show_bug.cgi?id=2253116
    https://access.redhat.com/errata/RHSA-2024:1860
    https://access.redhat.com/errata/RHSA-2024:1861
    https://access.redhat.com/errata/RHSA-2024:1862
    https://access.redhat.com/errata/RHSA-2024:1864
    https://access.redhat.com/errata/RHSA-2024:1866
    https://access.redhat.com/errata/RHSA-2024:1867
    https://access.redhat.com/errata/RHSA-2024:1868
    https://access.redhat.com/security/cve/CVE-2023-6544
    https://bugzilla.redhat.com/show_bug.cgi?id=2253116

    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