CVE-2023-27490 — NextAuth

NextAuth.js is an open source authentication solution for Next.js applications. `next-auth` applications using OAuth provider versions before `v4.20.1` have been found to be subject to an authentication vulnerability. A bad actor who can read traffic on the victim's network

01What is this vulnerability?

NextAuth.js is an open source authentication solution for Next.js applications. `next-auth` applications using OAuth provider versions before `v4.20.1` have been found to be subject to an authentication vulnerability. A bad actor who can read traffic on the victim's network or who is able to social engineer the victim to click a manipulated login link could intercept and tamper with the…

02Affected products

Vendor	Product	Versions
nextauthjs	next	auth — < 4.20.1

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2023-03-09T20:37:11.407Z
• Last modified: 2025-02-25T14:59:02.632Z

09References

• github.com — https://github.com/nextauthjs/next-auth/security/advisories/GHSA-7r7x-4c4q-c4qf
• authjs.dev — https://authjs.dev/reference/core/providers#checks
• danielfett.de — https://danielfett.de/2020/05/16/pkce-vs-nonce-equivalent-or-not/
• next-auth.js.org — https://next-auth.js.org/configuration/initialization#advanced-initialization
• next-auth.js.org — https://next-auth.js.org/configuration/providers/oauth
• www.rfc-editor.org — https://www.rfc-editor.org/rfc/rfc6749#section-10.12
• security.netapp.com — https://security.netapp.com/advisory/ntap-20230420-0006/