by Kastro
Paper/Archive/CVE-2026-71262

CVE-2026-71262

IoTSharp IoTSharp — IoTSharp BlobStorageController Missing Authentication and Path Traversal

EPSS 0.6%CVSS 9.8
critical.is priorityof 100
39
CVSS 9.8 (CNA)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 50.2.502 × 2010.0No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

IoTSharp BlobStorageController.cs lacks the [Authorize] attribute applied to every other controller in the application (DevicesController, CustomersController, TenantsController, etc.), and no global authorization FallbackPolicy is configured in Startup.cs, leaving its Upload/Download/List/Modify/Delete endpoints reachable by unauthenticated remote attackers.

Affected

ProductAffectedFixed inSource
IoTSharp≤ *–CNA

Scores by source

TuranSec (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

writeupgithub.com/IoTSharp/IoTSharpwriteupgithub.com/IoTSharp/IoTSharp/blob/master/IoTSharp/Controllers/BlobStorageController.cs