CVE-2026-40155: Auth0 Next.js SDK has Improper Proxy Cache Lookup
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.
Vector CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:L/A:N · CWE-362, CWE-863
Tracked companies
Mapped from the CVE’s affected-product data, NVD CPE matches, vendor advisories or package feeds. A mapping means the vendor’s software is named, not that its hosted service was exposed.
Status incidents that name it
No tracked status incident names this CVE.
Affected vendors and products
auth0: nextjs-auth0
References
- CVE record on cve.org (opens in new tab)
- NVD entry (opens in new tab)
- github.com/auth0/nextjs-auth0/commit/98c36dc306970c2230ea1a32efef431d29b99978 (opens in new tab)
- github.com/auth0/nextjs-auth0/releases/tag/v4.18.0 (opens in new tab)
- github.com/auth0/nextjs-auth0/security/advisories/GHSA-xq8m-7c5p-c2r6 (opens in new tab)
- CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (opens in new tab)
- This product uses data from the NVD API but is not endorsed or certified by the NVD. (opens in new tab)
- Known Exploited Vulnerabilities catalog from CISA. (opens in new tab)
- EPSS scores from FIRST (Exploit Prediction Scoring System). (opens in new tab)