CVE-2026-40155

Auth0 Next.js SDK has Improper Proxy Cache Lookup

State: Published
Severity: 5.4 Medium
Published: Apr 17, 2026
Updated: Apr 20, 2026
Reserved: Apr 9, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	5.4 Medium	CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:L/A:N	GitHub_M

Weaknesses

CWE-863 Incorrect Authorization
CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Affected Products

Product	Versions
nextjs-auth0auth0	>= 4.12.0, < 4.18.0Affected

References

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.