CVE-2026-36537

Critical severity, CVSS 9.8. EPSS: 0.8% chance of exploitation in the next 30 days.

ThingsBoard v4.3.0.1 is vulnerable to an authentication bypass during the OAuth authorization code exchange. The application improperly trusts user-supplied identity data within the user parameter of the /login/oauth2/code/ endpoint. By manipulating the email address in this JSON object, a remote attacker can bypass authentication and gain full access to any existing user account on the platform without possessing the target user's credentials. This results in a complete account takeover.

Published 2026-06-15. Last modified 2026-06-17.