Improper Validation of Query Parameters in Auth0 Next.js SDK CVE-2025-67716 - Dec 10, 2025

Description

An input-validation flaw in the returnTo parameter in the Auth0 Next.js SDK could allow attackers to inject unintended OAuth query parameters into the Auth0 authorization request. Successful exploitation may result in tokens being issued with unintended parameters

Affected Versions

You are affected if you meet the following preconditions:

Applications using the auth0/nextjs-auth0 SDK version >= 4.9.0 and < 4.13.0

Resolution

Upgrade Auth0/nextjs-auth0 version to v4.13.0

Acknowledgements

Okta would like to thank Joshua Rogers (MegaManSec) for their discovery and responsible disclosure.

CVE details

CVE ID	CVE-2025-67716
Published Date	2025-12-10
Vulnerability Type	Incomplete Input Validation
CWE	CWE-184 - Incomplete List of Disallowed Inputs
CVSS v3	Score: 5.7 Vector string: https://www.first.org/cvss/calculator/3-1#CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:N

References

Improper Validation of Query Parameters in Auth0 Next.js SDK