CVE-2025-71403

High

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.

SeverityHigh

CVSS7.1

Exploit probability—

ProductBetter-auth

PublishedAug 1, 2026

First seenAug 1, 2026

Weakness typeCWE-601Open redirect

How to fix

Update

better-auth1.1.21 or later

Vendor advisories

github.com/better-auth/better-auth/security/advisories/GHSA-vp58-j275-797x

Affected products

Product	Affected versions	Fixed in
better-authnpm	v < 1.1.21	1.1.21

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