CVE-2025-67716: nextjs-auth0 — Fix

Description

The Auth0 Next.js SDK is a library for implementing user authentication in Next.js applications. Versions 4.9.0 through 4.12.1 contain an input-validation flaw in the returnTo parameter, which 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. This issue is fixed in version 4.13.0.

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CVSS v3.1 Score

5.7

MEDIUM

CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:N

Weakness Type (CWE)

CWE-184 CWE-184

Affected Products

Vendor	Product	Versions
auth0	nextjs-auth0	4.9.0 — 4.12.1

References

Advisories & Patches

https://github.com/auth0/nextjs-auth0/commit/35eb321de3345ccf23e8c0d6f66c9f2f2f57d26c https://github.com/auth0/nextjs-auth0/security/advisories/GHSA-mr6f-h57v-rpj5

Frequently Asked Questions

What is CVE-2025-67716? +

The Auth0 Next.js SDK is a library for implementing user authentication in Next.js applications. Versions 4.9.0 through 4.12.1 contain an input-validation flaw in the returnTo parameter, which 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. This issue is fixed in version 4.13.0. It has a CVSS v3.1 base score of 5.7 (MEDIUM).

How severe is CVE-2025-67716? +

CVE-2025-67716 has a CVSS v3.1 score of 5.7 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-67716? +

CVE-2025-67716 affects products from auth0, specifically: nextjs-auth0. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-67716? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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