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High severity · published Jun 14, 2026
CVE-2026-12187
GL.iNet GL-MT3000 Online Firmware Upgrade one_click_upgrade command injection
8.8
CVSS
1.9%
EPSS
No
On KEV
Description
A security vulnerability has been detected in GL.iNet GL-MT3000 up to 4.4.5. Affected by this vulnerability is an unknown functionality of the file /usr/bin/one_click_upgrade of the component Online Firmware Upgrade Handler. Such manipulation leads to command injection. The attack can be launched remotely. The exploit has been disclosed publicly and may be used. Upgrading to version 4.7 addresses this issue. Upgrading the affected component is advised. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.9% · higher than 80% 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
Affected product
GL
GL-MT3000
GL.iNet
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-12187
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-12187
fw.gl-inet.com
https://fw.gl-inet.com/firmware/mt3000/release/mt3000-4.8.1-0819-1755615825.tar
github.com
https://github.com/StrTzz123/iot_vul/tree/main/GL-iNet/MT3000/4.4.5/upgrade_online_url
vuldb.com
https://vuldb.com/cve/CVE-2026-12187
vuldb.com
https://vuldb.com/submit/815654
vuldb.com
https://vuldb.com/vuln/370833
vuldb.com
https://vuldb.com/vuln/370833/cti
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