Authentication Bypass in ThingsBoard v4.3.0.1
CVE-2026-36537

9.8CRITICAL

Key Information:

Vendor

ThingsBoard

Status
ThingsBoard
Vendor
CVE Published:
15 June 2026

What is CVE-2026-36537?

ThingsBoard v4.3.0.1 is susceptible to an authentication bypass during the OAuth authorization code exchange process. The application incorrectly trusts user-supplied data received in the user parameter at the /login/oauth2/code/ endpoint. This flaw allows remote attackers to manipulate the email address within the JSON object, enabling them to bypass authentication and gain unauthorized access to any user account on the platform without needing the target user's credentials. This effectively results in a complete compromise of user accounts.

References

https://gist.github.com/KKC73/b9d4efda05693882f1e613c0e0f...

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.