Improper Validation of Query Parameters in Auth0 Next.js SDK
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
Am I Affected?
You are affected if you meet the following preconditions:
- Applications using the auth0/nextjs-auth0 SDK version prior to 4.13.0
Affected product and versions
Auth0/nextjs-auth0 versions >= 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.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | @auth0/nextjs-auth0 | >= 4.9.0, < 4.13.0 | 4.13.0 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N- Weakness (CWE)
CWE-184- Platform
- npm
- Package
@auth0/nextjs-auth0- Disclosed
- 10.12.2025
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-mr6f-h57v-rpj5 - CC BY 4.0
Vulnerability history: @auth0/nextjs-auth0
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 7
- First → latest
- 06.2021 04.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 2
- Medium 4
- Low 1
Disclosures per year
- 2021: 2
- 2022: 0
- 2023: 0
- 2024: 0
- 2025: 4
- 2026: 1
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Improper Validation of Query Parameters in Auth0 Next.js SDK this entry
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