Vulnerability · Published Aug 5, 2026 · Assigned by TuranSec

CVE-2026-71262IoTSharp BlobStorageController Missing Authentication and Path Traversal

Critical 9.8

In plain English

A critical-severity missing authentication in IoTSharp from IoTSharp. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 50% of all known vulnerabilities).

Severity (CVSS 3.1)9.8Critical

Exploit odds (30 days)0.6%top 49.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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 products (as reported)

Vendor	Product	Versions
IoTSharp	IoTSharp	0 – through *

Weakness: CWE-306 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

https://github.com/IoTSharp/IoTSharp third-party-advisory
https://github.com/IoTSharp/IoTSharp/blob/master/IoTSharp/Controllers/BlobStorageController.cs third-party-advisory