Improper Access Control in D-Link NAS Devices
CVE-2026-5311

6.9MEDIUM

Key Information:

Vendor

D-link
Status
Dns-120
Dnr-202l
Dns-315l
Dns-320
Vendor
CVE Published:
1 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-5311?

A vulnerability has been identified in various D-Link NAS devices that allows attackers to manipulate the argument 'cmd' within the WebDAV access list functionality of the /cgi-bin/file_center.cgi file. This flaw results in improper access controls, potentially enabling unauthorized remote access. The exploit has already been publicly disclosed, posing a significant risk to users of affected products.

Affected Version(s)

DNR-202L 20260205

DNR-322L 20260205

DNR-326 20260205

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-5311 - Proof of Concept

References

https://vuldb.com/vuln/354640
vdb-entrytechnical-description
https://vuldb.com/vuln/354640/cti
signaturepermissions-required
https://vuldb.com/submit/780441
third-party-advisory

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Ziyue Xie (VulDB User)
.