CVE-2026-18686: GL.iNet GL-MT3000 nas-web RPC Wrapper glc nas-web.add_user command injection

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 4.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-04 · updated 2026-10-23
Weakness: CWE-74

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.

Affected products

GL.iNet GL-MT3000: 4.4.0, 4.4.1, 4.4.2, 4.4.3, 4.4.4, 4.4.5

References

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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