CVE-2025-71403

Summary

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 Software

Weaknesses

• CWE-601: URL Redirection to Untrusted Site ('Open Redirect')

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: partial

References

• https://github.com/better-auth/better-auth/security/advisories/GHSA-vp58-j275-797x
• https://www.vulncheck.com/advisories/better-auth-before-open-redirect-via-trustedorigins-bypass

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