CVE-2021-43812

Name: CVE-2021-43812
Creator: NVD / NIST
Published: 2021-12-16T19:15:08.353+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 0.66%

Last modified Jun 17, 2026

CVE-2021-43812 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. The Auth0 Next.js SDK is a library for implementing user authentication in Next.js applications. Versions before 1.6.2 do not filter out certain returnTo parameter values from the login url, which expose the application to an open redirect vulnerability. EPSS estimates a 0.66% chance of exploitation in the next 30 days.

Description

The Auth0 Next.js SDK is a library for implementing user authentication in Next.js applications. Versions before 1.6.2 do not filter out certain returnTo parameter values from the login url, which expose the application to an open redirect vulnerability. Users are advised to upgrade as soon as possible. There are no known workarounds for this issue.

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

0.66%

46.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-601

Affected Software

Vendor	Product	Versions
Auth0	Nextjs-Auth0	< 1.6.2

References

https://github.com/auth0/nextjs-auth0/commit/0bbd9f8a0c93af51f607f28633b5fb18c5e48ad6Patch, Third Party Advisory
https://github.com/auth0/nextjs-auth0/security/advisories/GHSA-2mqv-4j3r-vjvpThird Party Advisory
https://github.com/auth0/nextjs-auth0/commit/0bbd9f8a0c93af51f607f28633b5fb18c5e48ad6Patch, Third Party Advisory
https://github.com/auth0/nextjs-auth0/security/advisories/GHSA-2mqv-4j3r-vjvpThird Party Advisory

Timeline

Published: Dec 16, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-43812?

How severe is CVE-2021-43812?

CVE-2021-43812 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 0.66% probability of exploitation in the next 30 days.

How do I fix CVE-2021-43812?

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.

Are you affected by CVE-2021-43812?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST