Auth bypass in Iotsharp
CVE-2026-111629
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.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- hackmd.io/@hieuPenguinnn/iotsharp-devices-customers-cross-tenant-idor (third-party-advisory)
- github.com/IoTSharp/IoTSharp/blob/v3.6.1/IoTSharp/Controllers/CustomersControll… (technical-description)
- github.com/IoTSharp/IoTSharp/blob/v3.6.1/IoTSharp/Controllers/DevicesController… (technical-description)
- www.vulncheck.com/advisories/iotsharp-through-3.6.1-cross-tenant-data-exposure-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-111629?
- CVE-2026-111629 is a medium-severity vulnerability in Iotsharp, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.3/10. Published 2026-10-16.
- How severe is CVE-2026-111629?
- Medium severity. CVSS v3 base score is 4.3 out of 10.