CVE-2026-42280 PUBLISHED

Improper Permission Checking in Auth.js SDK

Assigner: GitHub_M
Reserved: 26.04.2026 Published: 27.05.2026 Updated: 27.05.2026

Auth0.js is a client-side JavaScript library for Auth0. From 8.11.0 to 9.32.0, under specific preconditions, the Auth0.js SDK may improperly return user profile information using a valid access token when a specifically crafted invalid ID token is provided. This vulnerability is fixed in 10.0.0.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
CVSS Score: 7.1

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

CVSS 3.1

Product Status

Vendor	auth0
Product	auth0.js
Versions	Version >= 8.11.0 , <= 9.32.0 is affected

References

https://github.com/auth0/auth0.js/security/advisories/GHSA-8qjv-jj2q-x832

Problem Types

CWE-863: Incorrect Authorization CWE