PT-2026-33516 · Auth0 · Nextjs-Auth0

Published 2026-04-17 · Updated 2026-04-17 · CVE-2026-40155

NVD

CVSS v3.1

5.4

Medium

AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:L/A:N

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.

Fix

Race Condition

Incorrect Authorization

Weakness Enumeration

CWE-362

CWE-863

Related Identifiers

CVE-2026-40155

Affected Products

Nextjs-Auth0

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-40155 · Security Note
• https://github.com/auth0/nextjs-auth0/releases/tag/v4.18.0 · Note
• https://github.com/auth0/nextjs-auth0/security/advisories/GHSA-xq8m-7c5p-c2r6 · Note
• https://github.com/auth0/nextjs-auth0/commit/98c36dc306970c2230ea1a32efef431d29b99978 · Note