Critical severity · published Aug 3, 2026
CVE-2026-18685
GL.iNet GL-MT3000 modem.so glc set_upgrade command injection
9.8
CVSS
3.6%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)3.6% · higher than 89% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
GL
GL-MT3000 · GL.iNet
4.4.0; 4.4.1; 4.4.2; 4.4.3; 4.4.4; 4.4.5 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-18685
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-18685
github.com
https://github.com/StrTzz123/iot_vul/tree/main/GL-iNet/MT3000/4.4.5/modem_set_upgrade_glc_rce
vuldb.com
https://vuldb.com/cve/CVE-2026-18685
vuldb.com
https://vuldb.com/submit/851593
vuldb.com
https://vuldb.com/vuln/385611
vuldb.com
https://vuldb.com/vuln/385611/cti
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