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    CVE-2025-71403

    better-auth versions before 1.1.20 contain a bypass vulnerability in trustedOrigins validation logic affecting absolute URLs and wildcard domains. Attackers can construct malicious callbackURL parameters that pass origin checks and trigger open redirects to steal sensitive tokens for account takeover.

    Published:Aug 1, 2026
    Last Modified:Aug 3, 2026
    EPS:Aug 1, 2026
    EPSS Score:0.00238
    CVSS Score:7.1

    Affected Products

    Vendor
    Better-auth
    Product
    Better-auth\/oauth-provider
    Vendor
    Better-auth
    Product
    Better Auth

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-178 Cross-Site Flashing

    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