CVE-2026-12187highCWE-74CWE-77

CVE-2026-12187: high-severity vulnerability in GL.iNet GL-MT3000

GL.iNet GL-MT3000 Online Firmware Upgrade one_click_upgrade command injection

Published · Updated

41Vexday Risk Score

No sign of exploitation. It has a public proof of concept.

ssvc Attendcvss 8.7epss 1.9%
exploitation probability
1.9%top 21% of all CVEs
observed exploitation
nono source reports it
1 public exploit(s)
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:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P
Affected products
GL.iNet · GL-MT3000
public PoCs found — 1
cve_referencegithub.com/StrTzz123/iot_vul/tree/main/GL-iNet/MT3000/4.4.5/upgrade_online_urlunverified
⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
Related CVEs — GL.iNet GL-MT3000

In the same product, most dangerous first.

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References
https://fw.gl-inet.com/firmware/mt3000/release/mt3000-4.8.1-0819-1755615825.tarhttps://github.com/StrTzz123/iot_vul/tree/main/GL-iNet/MT3000/4.4.5/upgrade_online_urlhttps://vuldb.com/cve/CVE-2026-12187https://vuldb.com/submit/815654https://vuldb.com/vuln/370833https://vuldb.com/vuln/370833/cti