CVE-2021-3827

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    CVE-2021-3827

    Published: 23 Aug 2022Last Modified: 7 Aug 2026

    Summary:

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

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -ef47eee2dda29a0f08187ae67970323c28947f11

    Affected versions

    2.4.0.Test

    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
    CVE-2021-3827 | CVE-DB