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    CVE-2026-67328

    @better-auth/sso versions before 1.6.21 contain multiple authentication bypass vulnerabilities in SSO provider handling that allow attackers to sign in as arbitrary users. Attackers can exploit domain verification parsing mismatches, orphaned provider accounts, unbound SAML assertions, or reflected XSS on logout endpoints to gain unauthorized session access and account takeover.

    Published:Aug 1, 2026
    Last Modified:Aug 14, 2026
    EPS:Aug 1, 2026
    EPSS Score:0.00278
    CVSS Score:8.1

    Affected Products

    Vendor
    Better-auth
    Product
    Better-auth\/sso
    Vendor
    Better-auth
    Product
    Sso

    Exploits

    No exploit reference

    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