Is CVE-2025-71403 being exploited?

No public exploit is currently tracked.

How severe is CVE-2025-71403?

CVE-2025-71403 has a CVSS v3 severity of HIGH (7.1).

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CVE-2025-71403

Description

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.