EUVD-2026-36747
GHSA-cjqr-jj24-mfr6
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Remote unauthenticated callback tampering needs no privileges or interaction (AV:N/AC:L/PR:N/UI:N); full account takeover yields total confidentiality, integrity, and availability impact.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
3DescriptionCVE.org
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.
AnalysisAI
Authentication bypass in ThingsBoard IoT platform v4.3.0.1 lets a remote, unauthenticated attacker take over any account by tampering with the user-supplied 'user' JSON parameter during the OAuth2 authorization-code exchange at /login/oauth2/code/. Because the application trusts the attacker-controlled email in that object, swapping it for a victim's address yields a fully authenticated session with no credentials required. Publicly available exploit code exists (a POC gist), SSVC rates it automatable with total technical impact, but EPSS is low at 0.23% (14th percentile) and it is not on CISA KEV.
Technical ContextAI
ThingsBoard is an open-source IoT device-management and telemetry platform whose web login supports OAuth2/OIDC single sign-on. The flaw sits in the server-side handling of the OAuth2 authorization-code redemption endpoint (/login/oauth2/code/), where a JSON 'user' object carrying identity claims (notably the email) is accepted and trusted as-is rather than being bound to the identity provider's cryptographically verified token response. This is a textbook CWE-290 (Authentication Bypass by Spoofing): the platform maps the attacker-asserted email to an existing local account and issues a session, so identity is derived from client-controllable input instead of a validated IdP assertion.
RemediationAI
No vendor-released patch identified at time of analysis, and no fixed version is present in the provided data, so upgrade to a specific patched release cannot yet be cited - monitor the ThingsBoard project for a release above 4.3.0.1 addressing CVE-2026-36537. As compensating controls, disable OAuth2/OIDC SSO login if it is not essential (trade-off: forces users back to local/basic credentials and breaks federated login), or restrict network access to the /login/oauth2/code/ endpoint and the admin UI to trusted networks/VPN via reverse-proxy or WAF rules (trade-off: complicates legitimate external SSO and mobile access). Where SSO must stay on, place a proxy/WAF rule that rejects requests supplying a client-controlled 'user' JSON body on the OAuth2 callback and enforce that identity is derived only from the IdP token, and closely monitor authentication logs for logins to privileged accounts from unexpected sources. Consult the NVD entry (https://nvd.nist.gov/vuln/detail/CVE-2026-36537) and the POC gist (https://gist.github.com/KKC73/b9d4efda05693882f1e613c0e0fac78d) to build detection signatures.
LibreNMS before 24.10.0 allows a remote attacker to execute arbitrary code via OS command injection involving AboutContr
Reachable assertion in Open5GS up to version 2.7.6 allows remote unauthenticated attackers to crash the Diameter CER han
A Command Injection issue in the payload build page in BYOB (Build Your Own Botnet) 2.0 allows attackers to execute arbi
Denial of service in Open5GS 2.7.6 and earlier allows network-adjacent attackers with low-privilege Diameter Gx peer acc
Denial of service in Open5GS HSS (Home Subscriber Server) versions 2.7.0 through 2.7.6 is triggered remotely by manipula
Remote command injection in Control Web Panel allows unauthenticated attackers to execute arbitrary OS commands as root
LINQPad before 5.52.01 Pro edition is vulnerable to Unsafe Deserialization in LINQPad.AutoRefManager::PopulateFromCache(
Remote code execution in dash-uploader (Python package for Plotly Dash) versions 0.1.0 through 0.7.0a2 allows unauthenti
Command injection in LiteLLM 1.18.10 lets attackers who can configure MCP (Model Context Protocol) servers supply arbitr
SQL injection in AzuraCast's backup restore flow (versions up to and including 0.23.7) lets an attacker achieve privileg
Arbitrary file read in Yu AI Code Mother v4.3 lets anonymous, remote attackers retrieve files outside the intended previ
Remote code execution in APScheduler (all versions through 3.10.x and 4.0.0a5) is achievable when applications deseriali
Same weakness CWE-290 – Authentication Bypass by Spoofing
View allSame technique Authentication Bypass
View allShare
External POC / Exploit Code
Leaving vuln.today