---
cve: "CVE-2026-67327"
severity: "HIGH"
cvss: 8.7
epss: "0.3%"
vendor: "better-auth"
kev: false
exploited: false
published: "2026-08-01 13:17:03"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-26T08:46:57+02:00"
---

# CVE-2026-67327

> 8.7 HIGH · 🧪 PoC

## Beschreibung

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.

## CVSS-Vektor

```
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
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |

## Patch verfügbar (OSV)

- a90d061de7cdbd60e796230aadf5d1082add1fe2 (Commit)
- ba52913eed6e7210808511752bf546981f6980f5 (Commit)

## Referenzen

- <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>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-67327) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_