CVE-2026-18686
Received Received - Intake

Command Injection in GL.iNet GL-MT3000

Publication date: 2026-08-04

Last updated on: 2026-08-04

Assigner: VulDB

Description
A vulnerability was detected in GL.iNet GL-MT3000 up to 4.4.5. The affected element is the function nas-web.add_user of the file /cgi-bin/glc of the component nas-web RPC Wrapper. Performing a manipulation results in command injection. The attack can be initiated remotely. The exploit is now public and may be used. The vendor was contacted early about this disclosure and confirmed the existence of the vulnerability.

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Meta Information

Published
2026-08-04
Last Modified
2026-08-04
Generated
2026-08-04
AI Q&A
2026-08-04
EPSS Evaluated
N/A
NVD
CVE-2026-18686
EUVD
EUVD-2026-52547

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
gl.inet gl-mt3000 to 4.4.5 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-74 The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component.
CWE-77 The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component.

Attack-Flow Graph

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Executive Summary

This vulnerability is a command injection flaw in the GL.iNet GL-MT3000 router firmware up to version 4.4.5. It exists in the nas-web.add_user function within the /cgi-bin/glc file, part of the nas-web RPC Wrapper component. An attacker can remotely exploit this to execute arbitrary commands on the affected device.

Impact Analysis

If exploited, this vulnerability allows remote attackers to gain full control over the affected GL-MT3000 router. This could lead to unauthorized access, data theft, network compromise, or the device being used as part of a botnet for further attacks. Users should update firmware immediately.

Mitigation Strategies

Immediately update GL.iNet GL-MT3000 to a version beyond 4.4.5 to address the command injection vulnerability in nas-web.add_user. If an update is unavailable, disable remote access to the vulnerable component or isolate the device from critical networks until patched.

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