Vulnerability record · CVE-2026-18686 · published 4 August 2026

CVE-2026-18686: Injection vulnerability

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.

8.9 CVSS 4.0 High EPSS 4.7% · top 8.5% CWE-74 · InjectionCWE-77 · Command injection Deferred

8.9CVSS 4.0 base score, v2 10.0

4.7%EPSS exploitation probability, 30 days

NoNot in CISA KEV

0Affected product versions listed by NVD

5References

12 Aug 2026Last modified by NVD

Description

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:

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-18686), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.