GHSA-4pc7-vqv5-5r3v

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    GHSA-4pc7-vqv5-5r3v

    Published: 27 Apr 2022Last Modified: 8 Jul 2026
    Aliases:
    CVE-2021-3827

    Summary: ECP SAML binding bypasses authentication flows

    Details: ### Description A flaw was found in keycloak, where the default ECP binding flow allows other authentication flows to be bypassed. By exploiting this behavior an attacker can bypass the MFA authentication by sending a SOAP request with an AuthnRequest and Authorization header with the user's credentials. The highest threat from this vulnerability is to confidentiality and integrity.

    References: https://github.com/keycloak/keycloak/security/advisories/GHSA-4pc7-vqv5-5r3v, https://nvd.nist.gov/vuln/detail/CVE-2021-3827, https://github.com/keycloak/keycloak/commit/44000caaf5051d7f218d1ad79573bd3d175cad0d, https://access.redhat.com/security/cve/CVE-2021-3827, https://bugzilla.redhat.com/show_bug.cgi?id=2007512, https://github.com/keycloak/keycloak

    Affected packages

    Package

    Name: org.keycloak:keycloak-saml-core

    Purl: pkg:maven/org.keycloak/keycloak-saml-core

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -18.0.0

    Affected versions

    1.1.0.Beta1
    1.1.0.Beta2
    1.1.0.Final
    1.1.1.Final

    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
    GHSA-4pc7-vqv5-5r3v | CVE-DB