What is CVE-2026-18685?

CVE-2026-18685 is a critical-severity vulnerability in Gl.inet Gl-Mt3000, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 9.8/10. Published 2026-08-04.

How severe is CVE-2026-18685?

Critical severity. CVSS v3 base score is 9.8 out of 10.

RCE in Gl.inet Gl-Mt3000

CVE-2026-18685

A security vulnerability has been detected in GL.iNet GL-MT3000 up to 4.4.5. Impacted is the function set_upgrade of the file /cgi-bin/glc of the component modem.so. Such manipulation leads to command injection. It is possible to launch the attack remotely. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure and confirmed the existence of the vulnerability.

EPSS: 0.020 (79.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Gl.inet Gl-mt3000 — versions 4.4.0, 4.4.1, 4.4.2

Weakness classification (CWE)

References

cna@vuldb.com (technical-description, vdb-entry)
cna@vuldb.com (signature, permissions-required)
cna@vuldb.com (third-party-advisory)
cna@vuldb.com (third-party-advisory)
cna@vuldb.com (exploit, patch)

Frequently asked questions

What is CVE-2026-18685?: CVE-2026-18685 is a critical-severity vulnerability in Gl.inet Gl-Mt3000, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 9.8/10. Published 2026-08-04.
How severe is CVE-2026-18685?: Critical severity. CVSS v3 base score is 9.8 out of 10.