CVE-2026-71262Disclosure

LOWCVSS 9.8 · CRITICAL

Signal is active with 1 mentions in latest observed window

Immediate actions

Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD 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.

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0.0/ 10 priority

Sources & remediation

Other references

Weakness type (CWE)

CWE-306

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

NONE

Threat summary

1 mentions across 1 observed day

What's happening

Technical details provided in 1 signal
Disclosure: 1 classified signal
1 total mentions across 1 day

Deep dive

Activity timeline1 mentions / 1d

Signal classification1 categories

Disclosure

1100.0%

Full discourse1 post

Upwind Security MDR@UpwindMDR91d
Disclosure
🚨Critical - IoTSharp BlobStorageController Unauth Path Traversal to File Write/RCE (CVE-2026-71262) IoTSharp BlobStorageController endpoints Upload/Download/List/Modify/Delete are exposed without auth due to missing authorization config. Unsanitized path/filename enables ../ traversal to read/write/modify/delete arbitrary files outside the blob dir, leading to RCE by planting a webshell in a web-accessible path. 👉Affected: IoTSharp (versions unknown)
Post summary
The post announces a critical uncontrolled path traversal vulnerability in IoTSharp’s BlobStorageController, enabling unauthenticated file writes and remote code execution through webshell deployment.
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