High severity7.1NVD Advisory· Published Aug 1, 2026· Updated Sep 8, 2026

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.

Affected products

Better Auth/Better Authllm-create
Range: <1.1.20

Patches

Vulnerability mechanics

References

github.com/better-auth/better-auth/security/advisories/GHSA-vp58-j275-797xnvd
www.vulncheck.com/advisories/better-auth-before-open-redirect-via-trustedorigins-bypassnvd

News mentions

Better Auth: 17 Vulnerabilities Disclosed Together, Including Critical Authorization Bypass Flaws
Vypr Intelligence · Aug 2, 2026

cvss	0.461
epss	0.000
exploit	0.000
kev	0.000
patch	-0.070
ransomware	0.000