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GL-iNet GL-MT3000 CVE-2026-18613

| EUVDEUVD-2026-52397 HIGH
Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') (CWE-74)
2026-08-03 VulDB GHSA-q4qj-7phf-qc9w
Information Disclosure 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 injection per reported CVSS 4.0 PR:N; full H/H/H impact reflects arbitrary execution on device; no scope change as compromise is contained within the router system.

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

6
Analysis Updated
Aug 03, 2026 - 18:28 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Aug 03, 2026 - 18:22 vuln.today
cvss_changed
Severity Changed
Aug 03, 2026 - 18:22 NVD
CRITICAL HIGH
CVSS changed
Aug 03, 2026 - 18:22 NVD
9.3 (CRITICAL) 8.9 (HIGH)
Analysis Generated
Aug 03, 2026 - 18:15 vuln.today
CVE Published
Aug 03, 2026 - 17:45 cve.org
CRITICAL 9.3

DescriptionCVE.org

A vulnerability has been found in GL-iNet GL-MT3000 up to 4.4.5. This issue affects the function plugins.set_config of the file /cgi-bin/glc of the component plugins.so Native Plugin. Such manipulation leads to injection. The attack can be launched remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure and confirmed the existence of the vulnerability.

AnalysisAI

Injection vulnerability in GL-iNet GL-MT3000 (Beryl AX) firmware through version 4.4.5 exposes the plugins.set_config function via /cgi-bin/glc to remote exploitation with no authentication or user interaction required per the CVSS 4.0 vector. Successful exploitation yields high confidentiality, integrity, and availability impact on the device, consistent with OS command or argument injection against the native plugin handler. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Identify exposed GL-MT3000 management interface
Delivery
Send crafted HTTP POST to /cgi-bin/glc
Exploit
Supply injection payload in plugins.set_config parameter
Execution
Trigger unsanitized execution in plugins.so native handler
Persist
Achieve OS-level command execution on router
Impact
Pivot or persist on network perimeter device
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Vulnerability AssessmentAI

Exploitation The vulnerable attack surface is the /cgi-bin/glc CGI endpoint, specifically its plugins.set_config handler within plugins.so. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 base score of 8.9 with AV:N/AC:L/AT:N/PR:N/UI:N and full H/H/H impact signals a high-severity, low-friction remote exploitation path. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker with network access to the GL-MT3000 management interface - either on the LAN or via the internet if remote management is enabled - sends a crafted HTTP request to /cgi-bin/glc invoking plugins.set_config with a malicious parameter containing an injection payload. The plugins.so native library processes the input without sanitization, causing the injected content to be interpreted as an OS command or argument within the router's execution context. …
Remediation No vendor-released patch has been identified at time of analysis; users should monitor GL-iNet's official firmware release channel for a version superseding 4.4.5 that addresses this vulnerability. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Identify and catalog all GL-MT3000 devices in use, verify firmware versions, and assess network exposure of affected devices to untrusted networks. …

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CVE-2026-18613 vulnerability details – vuln.today
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