Vulnerability · Published Dec 11, 2025 · Assigned by GitHub_M

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

Medium 5.7

In plain English

A medium-severity security flaw in nextjs-auth0 from auth0. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 18% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.7Medium

Exploit odds (30 days)0.3%top 81.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	@auth0/nextjs-auth0	4.13.0	GHSA-mr6f-h57v-rpj5

Affected products (as reported)

Vendor	Product	Versions
auth0	nextjs-auth0	>= 4.9.0, < 4.13.0

Weakness: CWE-184 · Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:N

References

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