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GL-MT3000 CVE-2026-18686

| EUVDEUVD-2026-52547 HIGH
Command Injection (CWE-77)
2026-08-04 VulDB GHSA-7892-84cj-c35c
Command Injection Gl Mt3000
8.9
CVSS 4.0 · Vendor: VulDB
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Severity by source

Vendor (VulDB) PRIMARY
8.9 CRITICAL
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
9.8 CRITICAL

Network-reachable CGI endpoint requires no authentication (PR:N per CVSS 4.0 source vector); OS command injection yields full system compromise (C:H/I:H/A:H) with no scope change beyond the device itself.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (VulDB).

CVSS VectorVendor: VulDB

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

4
Analysis Generated
Aug 04, 2026 - 00:29 vuln.today
Severity Changed
Aug 04, 2026 - 00:22 NVD
CRITICAL HIGH
CVSS changed
Aug 04, 2026 - 00:22 NVD
9.3 (CRITICAL) 8.9 (HIGH)
CVE Published
Aug 04, 2026 - 00:00 cve.org
HIGH 8.9

DescriptionCVE.org

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.

AnalysisAI

Command injection in GL.iNet GL-MT3000 router firmware (all versions through 4.4.5) allows unauthenticated remote attackers to execute arbitrary OS commands via the nas-web RPC wrapper's add_user function at /cgi-bin/glc. The vendor has confirmed the vulnerability exists following early disclosure, and a public proof-of-concept exploit is hosted on GitHub, materially lowering the barrier to exploitation. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Identify GL-MT3000 with nas-web accessible
Delivery
Send unauthenticated HTTP request to /cgi-bin/glc
Exploit
Inject shell metacharacters into add_user parameter
Execution
Firmware executes unsanitized OS command
Impact
Achieve arbitrary code execution as root
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Vulnerability AssessmentAI

Exploitation The GL-MT3000's NAS web sharing feature must be enabled and the /cgi-bin/glc CGI endpoint must be network-reachable from the attacker's position. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N) places this at the highest practical exploitability tier: no authentication, no special attack conditions, network-accessible, no user interaction required. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An unauthenticated attacker with network access to the GL-MT3000's web interface sends a crafted HTTP request to /cgi-bin/glc invoking the nas-web add_user RPC function with shell metacharacters embedded in a user-controlled parameter field. The firmware's NAS wrapper passes the unsanitized input to a system command, executing the injected payload with the privileges of the web process - likely root on this embedded platform. …
Remediation No vendor-released patch has been identified at time of analysis - no fixed firmware version appears in any of the provided references. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: inventory all GL-MT3000 devices in production and development environments, confirm firmware versions, and immediately restrict external access to the web management interface by blocking /cgi-bin/glc at network perimeter and firewalls. …

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CVE-2026-18686 vulnerability details – vuln.today
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