GHSA-4rxr-27mm-mxq9

Upstash Adapter missing token verification

### Impact Applications that use `next-auth` Email Provider and `@next-auth/upstash-redis-adapter` before v3.0.2 are affected. ### Description The Upstash Redis adapter implementation did not check for both the identifier (email) and the token, but only checking for the identifier when verifying the token in the email callback flow. An attacker who knows about the victim's email could easily sign in as the victim, given the attacker also knows about the verification token's expired duration. ### Patches The vulnerability is patched in v3.0.2. To upgrade, run one of the following: ``` npm i @next-auth/upstash-redis-adapter@latest ``` ``` yarn add @next-auth/upstash-redis-adapter@latest ``` ``` pnpm add @next-auth/upstash-redis-adapter@latest ``` ### Workarounds Using Advanced Initialization, developers can check the requests and compare the query's token and identifier before proceeding. Below is an example of how to do this: (Upgrading is still strongly recommended) ```js import { createHash } from "crypto" export default async function auth(req, res) { if (req.method === "POST" && req.action === "callback") { const token = req.query?.token const identifier = req.query?.email function hashToken(token: string) { const provider = authOptions.providers.find((p) => p.id === "email") const secret = authOptions.secret return ( createHash("sha256") // Prefer provider specific secret, but use default secret if none specified .update(`${token}${provider.secret ?? secret}`) .digest("hex") ) } const hashedToken = hashToken(token) const invite = await authOptions.adapter.useVerificationToken?.({ identifier, token: hashedToken, }) if (invite.token !== hashedToken) { res.status(400).json({ error: "Invalid token" }) } } return await NextAuth(req, res, authOptions) } ``` ### References EmailProvider: https://next-auth.js.org/providers/email Advanced Initialization: https://next-auth.js.org/configuration/initialization#advanced-initialization Upstash Redis Adapter: https://next-auth.js.org/adapters/upstash-redis ### For more information If you have any concerns, we request responsible disclosure, outlined here: https://next-auth.js.org/security#reporting-a-vulnerability