GHSA-q2mx-j4x2-2h74 URL Redirection to Untrusted Site ('Open Redirect') in next-auth

• npm next-auth: < 3.29.3 → fixed in 3.29.3 • npm next-auth: >= 4.0.0, < 4.3.3 → fixed in 4.3.3

Impact We found that this vulnerability is present when the developer is implementing an OAuth 1 provider (by extension, it means Twitter, which is the only built-in provider using OAuth 1), but upgrading is still recommended. `next-auth` v3 users before version 3.29.3 are impacted. (We recommend upgrading to v4, as v3 is considered unmaintained. See our migration guide) `next-auth` v4 users before version 4.3.3 are impacted. Patches We've released patches for this vulnerability in: • v3 - `3.29.3` • v4 - `4.3.3` You can do: ```sh npm i next-auth@latest ``` or ```sh yarn add next-auth@latest ``` or ```sh pnpm add next-auth@latest ``` (This will update to the latest v4 version, but you can change `latest` to `3` if you want to stay on v3.) Workarounds If you are not able to upgrade for any reason, you can add the following configuration to your `callbacks` option: ```ts // async redirect(url, baseUrl) { // v3 async redirect({ url, baseUrl }) { // v4 // Allows relative callback URLs if (url.startsWith("/")) return `${baseUrl}${url}` // Allows callback URLs on the same origin else if (new URL(url).origin === baseUrl) return url return baseUrl } ``` References This vulnerability was discovered right after https://github.com/nextauthjs/next-auth/security/advisories/GHSA-f9wg-5f46-cjmw was published and is very similar in nature. Read more about the `callbacks.redirect` option in the documentation: https://next-auth.js.org/configuration/callbacks#redirect-callback For more information If you have any concerns, we request responsible disclosure, outlined here: https://next-auth.js.org/security#reporting-a-vulnerability Timeline The issue was reported 2022 April 20th, a response was sent out to the reporter 8 minutes after, and a patch was produced within a few days.