CVE-2026-36537

critical · 9.8

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.

9.8

CVSS

0.5%

EPSS (exploit prob.)

43rd

EPSS percentile

2026-06-15

Published

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weaknesses

CWE-290

References

https://gist.github.com/KKC73/b9d4efda05693882f1e613c0e0fac78d
https://gist.github.com/KKC73/b9d4efda05693882f1e613c0e0fac78d

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-36537