CVE-2026-18686

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.

Overview

State: PUBLISHED
Assigner (CNA): VulDB
CVSS severity: CRITICAL
CVSS score: 9.3 / 10
CVSS vector: 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
Effective score: 9.3 / 10 CRITICAL source: CNA overview
CWE(s): CWE-77, CWE-74
Reserved: 2026-08-03
Published: 2026-08-04 00:00 UTC
Last updated: 2026-08-04 00:00 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/18xxx/CVE-2026-18686.json
Linked Threat: CVE-2026-18686 — GL.iNet GL-MT3000 nas-web RPC Wrapper glc nas-web.add_user command injection

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published: 2026-08-04 00:16:40 UTC
NVD last modified: 2026-08-04 16:16:21 UTC
NVD CVSS v3.1: 9.8 / 10 CRITICAL source: cna@vuldb.com
NVD CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploitability subscore: 3.9 / 10
Impact subscore: 5.9 / 10
EPSS score: 0.0261 (probability of exploitation in next 30 days)
EPSS percentile: 83.86% vs all CVEs — higher = more likely to be exploited, as of 2026-08-04

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2026-52547
Assigner: VulDB
Published: Aug 4, 2026, 12:00:12 AM
Updated: Aug 4, 2026, 3:04:21 PM
EUVD base score (CVSS 4.0): 9.3 / 10
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
EUVD-reported EPSS: 0.0000
Vendors: GL.iNet
Products: GL-MT3000 (4.4.5)

GL-MT3000 (4.4.3)

GL-MT3000 (4.4.0)

GL-MT3000 (4.4.4)

GL-MT3000 (4.4.2)

GL-MT3000 (4.4.1)
Aliases: GHSA-7892-84cj-c35c

ENISA 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.

EUVD references (5)

Affected products (1)

Vendor	Product	Versions	Platforms
GL.iNet	GL-MT3000	`4.4.0` (affected), `4.4.1` (affected), `4.4.2` (affected), `4.4.3` (affected), `4.4.4` (affected), `4.4.5` (affected)	—

Vendor references (5)

References embedded in the original CVE record by the assigning CNA.

VDB-385612 | GL.iNet GL-MT3000 nas-web RPC Wrapper glc nas-web.add_user command injection vdb-entrytechnical-description
VDB-385612 | CTI Indicators (IOB, IOC, TTP, IOA) signaturepermissions-required
CVE-2026-18686 | CVE Analysis and Report third-party-advisory
Submit #856139 | GL.iNet MT3000 4.4.5 Command Injection third-party-advisory
https://github.com/coconut652-7/IOT_Vul_Public/tree/main/Glinet/MT3000/nas-web/ADD_USER_ADD_SHARE exploit

Web references (0)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

No web references attached yet.

NVD-tagged references (5)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

https://github.com/coconut652-7/IOT_Vul_Public/tree/main/Glinet/MT3000/nas-web/ADD_USER_ADD_SHARE cna@vuldb.com
https://vuldb.com/cve/CVE-2026-18686 cna@vuldb.com
https://vuldb.com/submit/856139 cna@vuldb.com
https://vuldb.com/vuln/385612 cna@vuldb.com
https://vuldb.com/vuln/385612/cti cna@vuldb.com

Remediations (10)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

CVE-2026-18686 | Injection in Gl Mt3000 | CVETodo

web:cvetodo.com

CVE-2026-18686 is a CVSS 9.8 Injection vulnerability in Gl-inet's Gl Mt3000. See exploitation status, patch guidance, and technical details.

2026-08-04 20:26 UTC
Microsoft patches 622 flaws, restricts Kerberos RC4 | Cybernews

web:cybernews.com

Microsoft's July 2026 Patch Tuesday fixes a record 622 vulnerabilities and begins mandatory Kerberos RC4 enforcement, marking one of Windows' biggest security updates.

2026-08-04 20:26 UTC
Microsoft Patch Tuesday June 2026 - 198 Vulnerabilities Fixed ...

web:cybersecuritynews.com

Microsoft has released its June 2026 Patch Tuesday security updates, addressing a hefty 198 vulnerabilities across its product ecosystem. The June rollout, published on June 9, 2026 , stands out not only for its volume but also for the inclusion of three zero-day vulnerabilities that were actively exploited or publicly known before a fix was available. Administrators are urged to prioritize ...

2026-08-04 20:26 UTC
Security Update Guide - Microsoft

web:portal.msrc.microsoft.com

The Security Update Guide provides information on the latest Microsoft security updates, helping users understand and address potential vulnerabilities effectively.

2026-08-04 20:26 UTC
Description of the security update for Excel 2016: July 14, 2026 ...

web:support.microsoft.com

Note To apply this security update, you must have the release version of Excel 2016 installed on the computer.

2026-08-04 20:26 UTC
July's Patch Tuesday sees an end-of-support collision ... - Computerworld

web:www.computerworld.com

It's an absolute beast with over 700 fixes and active zero-days landing right as major SQL and SharePoint versions hit end of support.

2026-08-04 20:26 UTC
June 2026 Patch Tuesday: Updates and Analysis | CrowdStrike

web:www.crowdstrike.com

Microsoft patches 206 vulnerabilities in June 2026 Patch Tuesday, including three publicly disclosed zero-days.

2026-08-04 20:26 UTC
Patch Tuesday - July 2026 - Rapid7

web:www.rapid7.com

Microsoft is publishing 622 vulnerabilities on July 2026 Patch Tuesday, including a record-breaking 416 Windows vulnerabilities.

2026-08-04 20:26 UTC
Patch Tuesday - June 2026 - Rapid7

web:www.rapid7.com

Microsoft is publishing 200 vulnerabilities on June 2026 Patch Tuesday, including an HTTP/2 denial of service vulnerability and an elevation of privilege vulnerability in PowerToys.

2026-08-04 20:26 UTC
Patch Tuesday July 2026: Security Updates & CVE Analysis

web:zecurit.com

Get the complete breakdown of Microsoft's July 2026 Patch Tuesday. We analyze the latest security updates and all critical CVEs .

2026-08-04 20:26 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-18686.json.

{
  "containers": {
    "cna": {
      "affected": [
        {
          "cpes": [
            "cpe:2.3:o:gl-inet:gl-mt3000_firmware:*:*:*:*:*:*:*:*"
          ],
          "modules": [
            "nas-web RPC Wrapper"
          ],
          "product": "GL-MT3000",
          "vendor": "GL.iNet",
          "versions": [
            {
              "status": "affected",
              "version": "4.4.0"
            },
            {
              "status": "affected",
              "version": "4.4.1"
            },
            {
              "status": "affected",
              "version": "4.4.2"
            },
            {
              "status": "affected",
              "version": "4.4.3"
            },
            {
              "status": "affected",
              "version": "4.4.4"
            },
            {
              "status": "affected",
              "version": "4.4.5"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "reporter",
          "value": "coconut (VulDB User)"
        },
        {
          "lang": "en",
          "type": "coordinator",
          "value": "VulDB CNA Team"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "baseScore": 9.3,
            "baseSeverity": "CRITICAL",
            "vectorString": "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",
            "version": "4.0"
          }
        },
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R",
            "version": "3.1"
          }
        },
        {
          "cvssV3_0": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R",
            "version": "3.0"
          }
        },
        {
          "cvssV2_0": {
            "baseScore": 10,
            "vectorString": "AV:N/AC:L/Au:N/C:C/I:C/A:C/E:POC/RL:ND/RC:C",
            "version": "2.0"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-77",
              "description": "Command Injection",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-74",
              "description": "Injection",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-04T00:00:12.184Z",
        "orgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
        "shortName": "VulDB"
      },
      "references": [
        {
          "name": "VDB-385612 | GL.iNet GL-MT3000 nas-web RPC Wrapper glc nas-web.add_user command injection",
          "tags": [
            "vdb-entry",
            "technical-description"
          ],
          "url": "https://vuldb.com/vuln/385612"
        },
        {
          "name": "VDB-385612 | CTI Indicators (IOB, IOC, TTP, IOA)",
          "tags": [
            "signature",
            "permissions-required"
          ],
          "url": "https://vuldb.com/vuln/385612/cti"
        },
        {
          "name": "CVE-2026-18686 | CVE Analysis and Report",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://vuldb.com/cve/CVE-2026-18686"
        },
        {
          "name": "Submit #856139 | GL.iNet MT3000 4.4.5 Command Injection",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://vuldb.com/submit/856139"
        },
        {
          "tags": [
            "exploit"
          ],
          "url": "https://github.com/coconut652-7/IOT_Vul_Public/tree/main/Glinet/MT3000/nas-web/ADD_USER_ADD_SHARE"
        }
      ],
      "timeline": [
        {
          "lang": "en",
          "time": "2026-08-03T00:00:00.000Z",
          "value": "Advisory disclosed"
        },
        {
          "lang": "en",
          "time": "2026-08-03T02:00:00.000Z",
          "value": "VulDB entry created"
        },
        {
          "lang": "en",
          "time": "2026-08-03T17:55:25.000Z",
          "value": "VulDB entry last update"
        }
      ],
      "title": "GL.iNet GL-MT3000 nas-web RPC Wrapper glc nas-web.add_user command injection",
      "x_generator": [
        "VulDB PVTS v202608"
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
    "assignerShortName": "VulDB",
    "cveId": "CVE-2026-18686",
    "datePublished": "2026-08-04T00:00:12.184Z",
    "dateReserved": "2026-08-03T15:50:09.485Z",
    "dateUpdated": "2026-08-04T00:00:12.184Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}