CVE-2022-31127: Improper handling of email input in next-auth
First published: Wed Jul 06 2022(Updated: )
NextAuth.js is a complete open source authentication solution for Next.js applications. An attacker can pass a compromised input to the e-mail [signin endpoint](https://next-auth.js.org/getting-started/rest-api#post-apiauthsigninprovider) that contains some malicious HTML, tricking the e-mail server to send it to the user, so they can perform a phishing attack. Eg.: `balazs@email.com, <a href="http://attacker.com">Before signing in, claim your money!</a>`. This was previously sent to `balazs@email.com`, and the content of the email containing a link to the attacker's site was rendered in the HTML. This has been remedied in the following releases, by simply not rendering that e-mail in the HTML, since it should be obvious to the receiver what e-mail they used: next-auth v3 users before version 3.29.8 are impacted. (We recommend upgrading to v4, as v3 is considered unmaintained. next-auth v4 users before version 4.9.0 are impacted. If for some reason you cannot upgrade, the workaround requires you to sanitize the `email` parameter that is passed to `sendVerificationRequest` and rendered in the HTML. If you haven't created a custom `sendVerificationRequest`, you only need to upgrade. Otherwise, make sure to either exclude `email` from the HTML body or efficiently sanitize it.
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Nextauth.js Next-auth | <3.29.8 | |
| Nextauth.js Next-auth | >=4.0.0<4.9.0 |
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Reference Links
- https://github.com/nextauthjs/next-auth/commit/ae834f1e08a4a9915665eecb9479c74c6b039c9c
- https://github.com/nextauthjs/next-auth/releases/tag/next-auth%40v4.9.0
- https://github.com/nextauthjs/next-auth/security/advisories/GHSA-pgjx-7f9g-9463
- https://next-auth.js.org/getting-started/upgrade-v4
- https://next-auth.js.org/providers/email#customizing-emails
Frequently Asked Questions
What is CVE-2022-31127?
CVE-2022-31127 is a vulnerability in NextAuth.js that allows an attacker to pass malicious HTML to the e-mail signin endpoint, potentially tricking the e-mail server.
How does CVE-2022-31127 affect NextAuth.js?
CVE-2022-31127 affects NextAuth.js versions up to and excluding 3.29.8, as well as versions between 4.0.0 and 4.9.0.
What is the severity of CVE-2022-31127?
CVE-2022-31127 has a severity score of 6.1, indicating a high severity vulnerability.
How can I fix CVE-2022-31127?
To fix CVE-2022-31127, you should upgrade to NextAuth.js version 4.9.0 or later.
Where can I find more information about CVE-2022-31127?
More information about CVE-2022-31127 can be found at the following references: [GitHub Commit](https://github.com/nextauthjs/next-auth/commit/ae834f1e08a4a9915665eecb9479c74c6b039c9c), [GitHub Release](https://github.com/nextauthjs/next-auth/releases/tag/next-auth%40v4.9.0), [GitHub Security Advisory](https://github.com/nextauthjs/next-auth/security/advisories/GHSA-pgjx-7f9g-9463).
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