Incorrect Authorization Affecting @auth0/nextjs-auth0 package, versions >=4.12.0 <4.18.0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published21 Apr 2026
- disclosed17 Apr 2026
- creditReynaldo Immanuel
Introduced: 17 Apr 2026
CVE-2026-40155 (opens in a new tab)How to fix?
Upgrade @auth0/nextjs-auth0 to version 4.18.0 or higher.
Overview
@auth0/nextjs-auth0 is a Next.js SDK for signing in with Auth0
Affected versions of this package are vulnerable to Incorrect Authorization in the proxy cache fetcher. An attacker can gain unauthorized access to sensitive information or perform actions with insufficient authorization by sending simultaneous requests that trigger a nonce retry when the proxy handler /me/* or /my-org/* is used with DPoP enabled.
Note: This is only exploitable if both the proxy handler /me/* or /my-org/* and DPoP are enabled in the project.