CVE-2022-31127: 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...

Description

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.

Metrics

CVSS 3.1

6.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS Probability

0.90%

55.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Nextauth.Js	Next-Auth	< 3.29.8
Nextauth.Js	Next-Auth	>= 4.0.0, < 4.9.0

References

https://github.com/nextauthjs/next-auth/commit/ae834f1e08a4a9915665eecb9479c74c6b039c9cPatch, Third Party Advisory
https://github.com/nextauthjs/next-auth/releases/tag/next-auth%40v4.9.0Release Notes, Third Party Advisory
https://github.com/nextauthjs/next-auth/security/advisories/GHSA-pgjx-7f9g-9463Exploit, Third Party Advisory
https://next-auth.js.org/getting-started/upgrade-v4Vendor Advisory
https://next-auth.js.org/providers/email#customizing-emailsVendor Advisory
https://github.com/nextauthjs/next-auth/commit/ae834f1e08a4a9915665eecb9479c74c6b039c9cPatch, Third Party Advisory
https://github.com/nextauthjs/next-auth/releases/tag/next-auth%40v4.9.0Release Notes, Third Party Advisory
https://github.com/nextauthjs/next-auth/security/advisories/GHSA-pgjx-7f9g-9463Exploit, Third Party Advisory
https://next-auth.js.org/getting-started/upgrade-v4Vendor Advisory
https://next-auth.js.org/providers/email#customizing-emailsVendor Advisory

Timeline

Published: Jul 6, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2022-31127?

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.

How severe is CVE-2022-31127?

CVE-2022-31127 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 0.90% probability of exploitation in the next 30 days.

How do I fix CVE-2022-31127?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.