CVE-2026-67327: Better-Auth

High severity, CVSS 8.3. EPSS: 0.4% chance of exploitation in the next 30 days.

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 products

• Better-Auth Better-Auth: from 1.1.3, before 1.6.22 (fixed in 1.6.22); from 1.7.0-beta.0, before 1.7.0-beta.10 (fixed in 1.7.0-beta.10)

Published 2026-08-01. Last modified 2026-09-08.