# CVE-2026-40155

> Vulnerability · severity: **MEDIUM** (CVSS 5.4).

## Description

The Auth0 Next.js SDK is a library for implementing user authentication in Next.js applications. In versions 4.12.0 through 4.17.1, simultaneous requests that trigger a nonce retry may cause the proxy cache fetcher to perform improper lookups for the token request results. Users are affected if their project uses both the vulnerable versions and the proxy handler /me/* and /my-org/* with DPoP enabled. This issue has been fixed in version 4.18.0.

## Key facts

- **CVE ID:** CVE-2026-40155
- **Published:** 2026-04-17
- **CVSS severity:** MEDIUM
- **CVSS base score:** 5.4
- **CWE codes:** CWE-362, CWE-863

## Affected products

- `auth0:nextjs-auth0`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-40155

## Citation

> AI Analytics. CVE-2026-40155. Retrieved 2026-07-20 from https://api.ai-analytics.org/cve/CVE-2026-40155. Derived from NIST NVD. Licensed CC0.

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