CVE-2026-36537

Status: DeferredCritical (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.

CVSS

Version: 3.1
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Base score: 9.8

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 0.77%
Percentile among all scored CVEs: 54
Score date: 10/6/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

🎯 ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.

ExploitationT1190 Exploit Public-Facing Applicationinitial access95 %
Primary impactT1078 Valid Accountsstealth · persistence · privilege escalation · initial access95 %
Secondary impactT1098 Account Manipulationpersistence · privilege escalation75 %

AV:N/PR:N/UI:N indica red sin autenticación previa. OAuth bypass mediante manipulación del parámetro 'email' permite acceso no autorizado y control total de cuentas existentes.

Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.

🛡️ ATT&CK mitigations that cover these techniques

Privileged Account Management User Account Management Network Segmentation Multi-factor Authentication Application Developer Guidance Active Directory Configuration

Affected technologies (1)

⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.

Thingsboard — Thingsboard^AI

CWEs

CWE-290

References

Raw JSON (NVD)

Show

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  "published": "2026-06-15T20:16:25.907",
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  "lastModified": "2026-06-17T10:41:08.097",
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