Command Injection Vulnerability in GL.iNet GL-MT3000 Online Firmware Upgrade Feature
CVE-2026-12187

8.7HIGH

Key Information:

Vendor

Gl.inet

Status
Gl-mt3000
Vendor
CVE Published:
14 June 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-12187?

A vulnerability exists in the GL.iNet GL-MT3000 router due to an issue in the Online Firmware Upgrade Handler component. This vulnerability allows for command injection through the 'one_click_upgrade' functionality, which can be exploited remotely. As a result of this flaw, an attacker could execute arbitrary commands on the system. Users are strongly advised to upgrade to version 4.7 or higher to mitigate this security risk, as the vendor has promptly released a fix addressing this issue.

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-2026-12187 - Proof of Concept

References

https://vuldb.com/vuln/370833
vdb-entry
https://vuldb.com/vuln/370833/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-12187
third-party-advisory

CVSS V4

Score:
8.7
Severity:
HIGH
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

strforexc (VulDB User)
VulDB CNA Team
.