CVE-2026-36537

ThingsBoard v4.3.0.1 is vulnerable to an authentication bypass during the OAuth authorization code exchange

Critical · published June 15, 2026

CVSS v3.1
9.8
EPSS
1%
Percentile
55.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00767 · 55.0th percentile
Published
2026-06-15T00:00Z
EPSS history
Timeline
  • 15 JUN 00:00Z
    ThingsBoard v4.3.0.1 is vulnerable to an authentication bypass during the OAuth authorization code exchange
    cvelistv5