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Medium · 5.4 CVE-2026-40155 EUVD-2026-23537GHSA-xq8m-7c5p-c2r6

Auth0 Next.js SDK has Improper Proxy Cache Lookup

Published Apr 17, 2026 · Updated Apr 20, 2026 · Assigned by GitHub_M

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.

Affected products

VendorProductAffectedFixed
auth0 nextjs-auth0 >= 4.12.0, < 4.18.0 —

Affected packages

EcosystemPackageAffectedFixedRecord
npm @auth0/nextjs-auth0 >= 4.12.0, < 4.18.0 4.18.0 GHSA-xq8m-7c5p-c2r6

References