SB2026050688 - Improper access control in Auth0.js SDK
Published: May 6, 2026
Security Bulletin ID
SB2026050688
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper access control (CVE-ID: CVE-2026-42280)
The vulnerability allows a remote user to disclose user profile information.
The vulnerability exists due to improper access control in the Auth0.js SDK when processing a valid access token together with a specifically crafted invalid ID token. A remote user can provide a specifically crafted invalid ID token with a valid access token to disclose user profile information.
Only applications whose access control relies on rules defined in Auth0 Actions are vulnerable.
Remediation
Install update from vendor's website.