CVE-2022-31127

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CVE-2022-31127

Summary: Improper handling of email input in next-auth

Details: 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.: `[email protected], <a href="http://attacker.com">Before signing in, claim your money!</a>`. This was previously sent to `[email protected]`, 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.

References: https://github.com/nextauthjs/next-auth/releases/tag/next-auth%40v4.9.0, https://next-auth.js.org/getting-started/upgrade-v4, https://next-auth.js.org/providers/email#customizing-emails, https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/31xxx/CVE-2022-31127.json, https://github.com/nextauthjs/next-auth/security/advisories/GHSA-pgjx-7f9g-9463, https://nvd.nist.gov/vuln/detail/CVE-2022-31127, https://github.com/nextauthjs/next-auth/commit/ae834f1e08a4a9915665eecb9479c74c6b039c9c