Vulnerability 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. The path/filename parameters passed to these endpoints (e.g. `_blob.WriteFileAsync($"{path}/{formFile.FileName}", ...)`) are used without sanitization, enabling path traversal that allows writing, reading, modifying, and deleting arbitrary files outside the intended blob storage directory, including web-accessible paths that can be leveraged for remote code execution via webshell upload.
CVSS Score
CRITICAL
Related Weaknesses (CWE)
References
- https://github.com/IoTSharp/IoTSharp
- https://github.com/IoTSharp/IoTSharp/blob/master/IoTSharp/Controllers/BlobStorag
FAQ
What is CVE-2026-71262?
CVE-2026-71262 is a vulnerability with a CVSS score of 9.8 (CRITICAL). IoTSharp BlobStorageController.cs lacks the [Authorize] attribute applied to every other controller in the application (DevicesController, CustomersController, TenantsController, etc.), and no global ...
How severe is CVE-2026-71262?
CVE-2026-71262 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-71262?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.