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TI-2026-75415 Aliases CVE-2026-111629GHSA-42g8-wcwc-865r

Cross-tenant data exposure in IoTSharp Customers and Devices APIs

Priority MEDIUM 57CWE-639Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
Low · None · None
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-639.

Summary

IoTSharp through 3.6.1 contains an insecure direct object reference that lets any authenticated user read other tenants' data. The Customers and Devices API handlers do not limit queries to the caller's tenant (CWE-639). An attacker can self-register through the anonymous AccountController.Create endpoint, then supply other tenants' GUIDs to read customer contact details, device inventories and device attribute telemetry.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00315 24th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
IoTSharpIoTSharpup to 3.6.1—No fix listedCNA
  • IoTSharp VendorIoTSharp Affected up to 3.6.1 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for IoTSharp.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Timeline

  1. 2026-10-16 Threatist record created from CVE-2026-111629
  2. 2026-10-16 Alias added: GHSA-42g8-wcwc-865r
  3. 2026-10-21 CISA SSVC decision points changed
  4. 2026-10-21 Priority changed: LOW → MEDIUM

References

Advisory 1

Other 2

  • TI-2026-49930 IoTSharp BlobStorageController Missing Authentication and Path Traversal CVSS 3.1CRITICAL 9.8

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences