Auth0 Next.js SDK has Improper Proxy Cache Lookup

MITRE NVD CVE.ORG JSON API Print: PDF PDF

Summary

CVECVE-2026-40155
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-17 21:16:33 UTC
Updated2026-04-17 21:16:33 UTC
DescriptionThe 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.

Risk And Classification

Primary CVSS: v3.1 5.4 MEDIUM from [email protected]

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

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

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.4MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:L/A:N
3.1CNADECLARED5.4MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
Low
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Auth0 Nextjs-auth0 affected >= 4.12.0, < 4.18.0 Not specified

References

ReferenceSourceLinkTags
github.com/auth0/nextjs-auth0/releases/tag/v4.18.0 [email protected] github.com
github.com/auth0/nextjs-auth0/security/advisories/GHSA-xq8m-7c5p-c2r6 [email protected] github.com
github.com/auth0/nextjs-auth0/commit/98c36dc306970c2230ea1a32efef431d29b... [email protected] github.com
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