Is CVE-2026-40155 actively exploited?

No active exploitation of CVE-2026-40155 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-40155 be exploited remotely?

Yes. CVE-2026-40155 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-40155?

CVE-2026-40155 has a CVSS score of 5.4 (MEDIUM).

HOME VULNERABILITIESCVE-2026-40155

MEDIUM

CVE-2026-40155

CWE-362Published: April 17, 2026· Updated: Apr 20, 2026

5.4

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:12.1th

Official 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.

NVD Source

Technical Analysis

CVE-2026-40155 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 5.4.