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8.9

GL.iNet GL-MT3000 allows unauthorized user creation via remote attack

CVE-2026-18686 · published 3 months ago
Summary

The GL.iNet GL-MT3000's web interface has a security weakness that allows an attacker to create new users on the device without permission. This can happen if an attacker sends a malicious request to the device's web interface. It's essential to update the device's software to the latest version to fix this issue.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
gl.inet gl-mt3000 4.4.0
Original advisory text
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 mani...
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.
References
Fix within
Internet-facing 3 days
Internal 60 days
  • Not known to be exploited
  • Can be exploited automatically
  • Gives an attacker full control
Severity
8.9 High
Exploitation
5% chance of attack within 30 days
Type
CWE-74Injection
CWE-77Command Injection
Timeline
Published4 Aug 2026
Updated25 Oct 2026
First seen4 Aug 2026
Sources
CVE-2026-18686 · NVD
CVE-2026-18686 · MITRE
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