CVE-2026-42280
Auth0.js Access Token Information Exposure via Invalid ID Token
Publication date: 2026-05-27
Last updated on: 2026-05-27
Assigner: GitHub, Inc.
Description
Description
CVSS Scores
EPSS Scores
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| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| auth0 | auth0.js | 10.0.0 |
| auth0 | auth0.js | From 8.11.0 (inc) to 9.32.0 (inc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-863 | The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability exists in the Auth0.js client-side JavaScript library versions from 8.11.0 to 9.32.0. Under certain specific conditions, the SDK may improperly return user profile information when provided with a valid access token alongside a specially crafted invalid ID token. This means that the library could expose user profile data incorrectly due to the way it handles token validation.
The issue is fixed in version 10.0.0 of Auth0.js.
How can this vulnerability impact me? :
This vulnerability can lead to unauthorized disclosure of user profile information. An attacker who can provide a valid access token and a specially crafted invalid ID token may be able to retrieve sensitive user data that should not be accessible. This can compromise user privacy and potentially lead to further security issues.
The CVSS score of 7.1 indicates a high severity impact on confidentiality, with low attack complexity and no user interaction required.
What immediate steps should I take to mitigate this vulnerability?
To mitigate this vulnerability, upgrade the Auth0.js library to version 10.0.0 or later, where the issue is fixed.