CVE-2026-40155

EUVD-2026-23537 MEDIUM

2026-04-17 GitHub_M

Authentication Bypass

5.4

CVSS 3.1

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

High

Privileges Required

Low

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

Low

Availability

None

Lifecycle Timeline

patch_available

Apr 17, 2026 - 22:16 EUVD

Analysis Generated

Apr 17, 2026 - 21:37 vuln.today

DescriptionNVD

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.

AnalysisAI

Authentication bypass in Auth0 Next.js SDK versions 4.12.0 through 4.17.1 allows authenticated users with UI interaction to access sensitive endpoints through improper proxy cache lookups during concurrent nonce retry operations. The vulnerability specifically affects deployments using the proxy handler with DPoP (Demonstration of Proof-of-Possession) enabled, potentially exposing confidential user information via /me/* and /my-org/* endpoints. …

Analysis

Detailed AI-generated intelligence summary covering attack vector, impact assessment, affected versions, remediation steps, and indicators of compromise.

POChttps://••••••••••.com/exploit

PATCHhttps://••••••••••.com/patch

ADVISORYhttps://••••••••••.com/advisory

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CVE-2026-40155 vulnerability details – vuln.today

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