Command Injection Vulnerability in GL.iNet GL-MT3000 Product
CVE-2026-18686

9.3CRITICAL

Key Information:

Vendor

Gl.inet

Status
Gl-mt3000
Vendor
CVE Published:
4 August 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-18686?

A command injection vulnerability exists in the nas-web RPC Wrapper of GL.iNet GL-MT3000 devices prior to version 4.4.5. The flaw resides in the function nas-web.add_user within the /cgi-bin/glc file, allowing a remote attacker to execute arbitrary commands through crafted input. With exploit code now publicly available, immediate action is recommended for users to mitigate potential risks.

Affected Version(s)

GL-MT3000 4.4.0

GL-MT3000 4.4.1

GL-MT3000 4.4.2

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-2026-18686 - Proof of Concept

References

https://vuldb.com/vuln/385612
vdb-entrytechnical-description
https://vuldb.com/vuln/385612/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-18686
third-party-advisory

CVSS V4

Score:
9.3
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
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

coconut (VulDB User)
VulDB CNA Team
.