GHSA-xq8m-7c5p-c2r6

Auth0 Next.js SDK has Improper Proxy Cache Lookup

Source: GitHub Advisory Database (reviewed) Moderate CVE-2026-40155

Packages

Ecosystem	Package	Affected	Fixed in
npm	@auth0/nextjs-auth0	>= 4.12.0, < 4.18.0	4.18.0

Details

As written in the advisory (Markdown source, shown as plain text).

### Description In affected versions of the Next.js SDK, simultaneous requests that trigger a nonce retry may cause the proxy cache fetcher to perform improper lookups for the token request results. ### Which Projects are Affected? Users are affected if they meet all of the following preconditions: - Applications using the auth0/nextjs-auth0 SDK, versions 4.12.0 to 4.17.0, and - Applications using the proxy handler /me/* and /my-org/* with DPoP enabled. ### Affected product and versions Auth0/nextjs-auth0 v4.12.0 to 4.17.0 ### Resolution Upgrade Auth0/nextjs-auth0 version to v4.18.0 or greater ### Acknowledgements Okta would like to thank Reynaldo Immanuel for their discovery and responsible disclosure.

References

External links from the advisory. They lead to third-party sites.