CVE-2025-71403 in better-auth

Résumé

par MITRE • 01/08/2026

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.

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• Responsable: VulnCheck
• Réserver: 18/07/2026
• Divulgation: 01/08/2026
• Modérer: accepté
• Entrée: VDB-385246
• CPE: prêt
• CWE: CWE-601 (confirmé)
• CVSS: 4.3 (VulDB)
• EPSS: 0.00000
• KEV: non
• Activités: très faible

Sources

• MITRE: https://www.cve.org/CVERecord?id=CVE-2025-71403
• NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-71403
• CVE Details: https://www.cvedetails.com/cve/CVE-2025-71403/