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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.

PUBLISHED Reserved 2026-04-09 | Published 2026-04-17 | Updated 2026-04-20 | Assigner GitHub_M




MEDIUM: 5.4CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:L/A:N

Problem types

CWE-863: Incorrect Authorization

CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Product status

>= 4.12.0, < 4.18.0
affected

References

github.com/...-auth0/security/advisories/GHSA-xq8m-7c5p-c2r6

github.com/...ommit/98c36dc306970c2230ea1a32efef431d29b99978

github.com/auth0/nextjs-auth0/releases/tag/v4.18.0

cve.org (CVE-2026-40155)

nvd.nist.gov (CVE-2026-40155)

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