---
id: CVE-2026-111629
title: >-
  IoTSharp through 3.6.1 Cross-Tenant Data Exposure via Customers and Devices
  APIs
summary: >-
  IoTSharp through 3.6.1 contains an insecure direct object reference
  vulnerability that allows any authenticated user to read other tenants' data
  because Customers and Devices API handlers do not scope queries to the
  caller's tenant. Atta…
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N'
cvssSource: cna
cwe:
  - CWE-639
vendor: IoTSharp
product: IoTSharp
affected:
  - IoTSharp <= 3.6.1
published: '2026-10-16'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T17:39:03.518Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-111629'
references:
  - url: >-
      https://hackmd.io/@hieuPenguinnn/iotsharp-devices-customers-cross-tenant-idor
  - url: >-
      https://github.com/IoTSharp/IoTSharp/blob/v3.6.1/IoTSharp/Controllers/CustomersController.cs#L164-L177
  - url: >-
      https://github.com/IoTSharp/IoTSharp/blob/v3.6.1/IoTSharp/Controllers/DevicesController.cs#L490-L507
  - url: >-
      https://www.vulncheck.com/advisories/iotsharp-through-3.6.1-cross-tenant-data-exposure-via-customers-and-devices-apis
    label: >-
      VulnCheck Advisory: IoTSharp through 3.6.1 Cross-Tenant Data Exposure via
      Customers and Devices APIs
tags:
  - cve.org
ingestedAt: '2026-10-16T18:43:08.688Z'
---

## Overview

IoTSharp through 3.6.1 contains an insecure direct object reference vulnerability that allows any authenticated user to read other tenants' data because Customers and Devices API handlers do not scope queries to the caller's tenant. Attackers can self-register through the anonymous AccountController.Create endpoint and supply other tenants' GUIDs to read customer contact details, device inventories and device attribute telemetry.

## Affected

- `IoTSharp <= 3.6.1`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.