ThingsBoard 4.3.0.1 /login/oauth2/code User improper authorization

Summaryinfo

A vulnerability labeled as critical has been found in ThingsBoard 4.3.0.1. The impacted element is an unknown function of the file /login/oauth2/code. The manipulation of the argument User results in improper authorization. This vulnerability is identified as CVE-2026-36537. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability, which was classified as critical, was found in ThingsBoard 4.3.0.1. Affected is an unknown part of the file /login/oauth2/code. The manipulation of the argument user with an unknown input leads to a improper authorization vulnerability. CWE is classifying the issue as CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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 advisory is shared for download at gist.github.com. This vulnerability is traded as CVE-2026-36537 since 04/06/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 06/16/2026). The MITRE ATT&CK project declares the attack technique as T1548.002.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Forum Software

Name

• ThingsBoard

Version

• 4.3.0.1

CPE 2.3info

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CPE 2.2info

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