What is CVE-2023-27490?

CVE-2023-27490 is a high-severity vulnerability in Nextauth.js Next-Auth, classified under Cross-Site Request Forgery (CSRF). CVSS score: 8.1/10. Published 2023-03-09.

How severe is CVE-2023-27490?

High severity. CVSS v3 base score is 8.1 out of 10.

Is CVE-2023-27490 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

CSRF in Nextauth.js Next-Auth

CVE-2023-27490

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 authorization URL to **log in as the victim**, bypassing the CSRF protection. This is due to a partial failure during a compromised OAuth session where a session code is erroneously generated. This issue has been addressed in version 4.20.1. Users are advised to upgrade. Users unable to upgrade may using Advanced Initialization, manually check the callback request for state, pkce, and nonce against the provider configuration to prevent this issue. See the linked GHSA for details.

Vulnerability class: CSRF (Cross-Site Request Forgery)

Published 2023-03-09 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.005 (43.0th percentile), scored 2026-09-27.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 43rd percentile — 43.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Nextauth.js Next-Auth
Nextauthjs Next-Auth — versions < 4.20.1

Weakness classification (CWE)

Public proof-of-concept exploits

karimhabush/cyberowl

References

github.com/nextauthjs/next-auth/security/advisories/GHSA-7r7x-4c4q-c4qf (Exploit, Vendor Advisory)
authjs.dev/reference/core/providers (Product)
danielfett.de/2020/05/16/pkce-vs-nonce-equivalent-or-not/ (Not Applicable)
next-auth.js.org/configuration/initialization (Product)
next-auth.js.org/configuration/providers/oauth (Product)
www.rfc-editor.org/rfc/rfc6749 (Not Applicable)
security.netapp.com/advisory/ntap-20230420-0006/

Frequently asked questions

What is CVE-2023-27490?: CVE-2023-27490 is a high-severity vulnerability in Nextauth.js Next-Auth, classified under Cross-Site Request Forgery (CSRF). CVSS score: 8.1/10. Published 2023-03-09.
How severe is CVE-2023-27490?: High severity. CVSS v3 base score is 8.1 out of 10.
Is CVE-2023-27490 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.