CVE-2026-111629 IoTSharp CVE debrief

Who should care

IoTSharp users and administrators should assess exposure and prioritize remediation efforts immediately. The vulnerability affects IoTSharp versions up to 3.6.1 and involves improper scoping of queries to the caller's tenant in Customers and Devices APIs. This could lead to potential data exposure for tenants, necessitating verification of IoTSharp version and exposure to vulnerable APIs. IoTSharp users should verify IoTSharp version and API accesscontrols

Why it matters

CVE-2026-111629 is a medium-severity vulnerability in IoTSharp that allows authenticated users to access other tenants' data. IoTSharp users and administrators should assess exposure, prioritize remediation, and verify IoTSharp version and API access controls.

• Potential data exposure for tenants due to improper access control
• Need for verification of IoTSharp version and exposure to vulnerable APIs
• Possible impact on customer contact details and device inventories

Technical summary

IoTSharp through 3.6.1 contains an insecure direct object reference vulnerability that allows any authenticated user to read other tenants' data via Customers and Devices APIs. The vulnerability is due to improper scoping of queries to the caller's tenant. This could lead to potential data exposure for tenants, necessitating verification of IoTSharp version and exposure to vulnerable APIs. IoTSharp users and administrators should assess exposure and prioritize remediation efforts immediately. The vulnerability affects IoTSharp versions up to 3.6.1.

Defensive priority

Medium priority for IoTSharp users and administrators

Recommended defensive actions

• Review and update IoTSharp to a version beyond 3.6.1 if available
• Restrict access to Customers and Devices APIs to ensure proper tenant scoping
• Monitor for and respond to potential data exposure incidents
• Implement compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and source item provide details on the insecure direct object reference vulnerability in IoTSharp through 3.6.1. The vulnerability allows any authenticated user to read other tenants' data via Customers and Devices APIs. The source item includes references to technical descriptions and third-party advisories. IoTSharp users should verify IoTSharp version and API access controls, and consider additional defensive measures to mitigate potential data exposure.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.