CVE-2026-12187 GL.iNet GL-MT3000 Online Firmware Upgrade one_click_upgrade command injection
A remote command injection vulnerability in the GL.iNet GL-MT3000 Online Firmware Upgrade handler allows attackers to execute arbitrary commands on the router.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-12187?
CVE-2026-12187 is a high-severity command injection vulnerability in GL.iNet GL-MT3000, published on 14 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-12187?
How do I fix CVE-2026-12187?
No fix has been published for CVE-2026-12187 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-12187 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-12187 exists.
Sources
Also known as GHSA-8rqp-5vg5-cv68.