CVE-2026-67327

Summary

better-auth versions >= 1.1.3 and < 1.6.22 (and pre-release versions >= 1.7.0-beta.0 and < 1.7.0-beta.10) are vulnerable to account takeover via pre-account hijacking on magic-link and email-OTP sign-in when open email/password registration is enabled. An attacker registers an account with the victim's email address and an attacker-chosen password; the account remains unverified. When the legitimate owner later signs in via the magic-link or email-OTP passwordless flow, the account is marked verified without removing the pre-existing password or revoking existing sessions, so the attacker's password remains valid, granting persistent access to the victim's account. Fixed in 1.6.22 and 1.7.0-beta.10.

Affected Software

Weaknesses

• CWE-287: Improper Authentication

References

• https://github.com/better-auth/better-auth/security/advisories/GHSA-qq9h-g4jm-xgf3
• https://www.vulncheck.com/advisories/better-auth-before-account-takeover-via-magic-link-email-otp

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