5.7

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2025-67716

CVE-2025-67716: Auth0 Next.js SDK has Improper Validation of Query Parameters

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.

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2025-67716

CVE-2025-67716:

5.7

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
@auth0/nextjs-auth0	npm	>= 4.9.0, < 4.13.0	4.13.0

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability lies in the improper handling of the returnTo query parameter within the Auth0 Next.js SDK. The analysis of the patch commit 35eb321de3345ccf23e8c0d6f66c9f2f2f57d26c clearly shows the fix. The file src/server/helpers/with-page-auth-required.ts was modified to address the issue. Specifically, within the appRouteHandlerFactory function, the returnTo parameter is now wrapped with encodeURIComponent before being appended to the login redirect URL. The vulnerable code did not encode this parameter, allowing an attacker to inject malicious OAuth parameters into the authorization flow. The test file src/server/helpers/with-page-auth-required.test.ts was also updated with new test cases that explicitly check for this URL encoding, confirming the nature of the vulnerability and the fix. Therefore, the appRouteHandlerFactory is identified as the vulnerable function, as it contains the logic that constructs the improperly formed redirect URL.

Vulnerable functions

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Vulnerability Intelligence
Miggo AI

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WAF Rule

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Reasoning

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