CVE-2021-27736

    Dashboard / Vulnerabilities / CVE-2021-27736

    CVE-2021-27736

    Published: 22 Apr 2021Last Modified: 9 Jul 2026

    Summary:

    Details: FusionAuth fusionauth-samlv2 before 0.5.4 allows XXE attacks via a forged AuthnRequest or LogoutRequest because parseFromBytes uses javax.xml.parsers.DocumentBuilderFactory unsafely.

    References: https://github.com/FusionAuth/fusionauth-samlv2/commit/c66fb689d50010662f705d5b585c6388ce555dbd, https://github.com/FusionAuth/fusionauth-samlv2/compare/0.5.3...0.5.4, https://www.compass-security.com/fileadmin/Research/Advisories/2021-03_CSNC-2021-004_FusionAuth_SAML_Library_XML_External_Entity.txt

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -14c4772ee1f9a76c7bae50368884446878d68a68

    Affected versions

    0.5.3
    0.5.2
    0.5.1
    0.5.0

    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