medium5.4
CVE-2026-40155
The Auth0 Next.js SDK is a library for implementing user authentication in Next.js applications.
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | @auth0/nextjs-auth0 | >= 4.12.0, <= 4.17.0 | 4.18.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Auth0 | Nextjs-Auth0 | from 4.12.0 before 4.18.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-xq8m-7c5p-c2r6
- https://github.com/auth0/nextjs-auth0/security/advisories/GHSA-xq8m-7c5p-c2r6
- https://nvd.nist.gov/vuln/detail/CVE-2026-40155
- https://github.com/auth0/nextjs-auth0/commit/98c36dc306970c2230ea1a32efef431d29b99978
- https://github.com/auth0/nextjs-auth0/releases/tag/v4.18.0