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Vulnerability record · CVE-2026-36537 · published 15 June 2026

CVE-2026-36537: Authentication bypass by spoofing vulnerability

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 3.1 Critical EPSS 0.77% · top 46.3% CWE-290 · Authentication bypass by spoofing Deferred
9.8CVSS 3.1 base score
0.77%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

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.

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

References

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

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-36537), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.