Is CVE-2026-12187 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-12187 being exploited in the wild.

How severe is CVE-2026-12187?

High severity, with a CVSS score of 8.8, published 14 June 2026.

Is there a fix for CVE-2026-12187?

A patch was published on 2026-06-14: Vendor released version 4.7 to address the issue. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-12187 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2026-12187?

Check whether you run GL.iNet GL-MT3000 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-12187: GL.iNet GL-MT3000 command injection in Online Firmware Upgrade Handler

CVE-2026-12187 · Severity: high · CVSS 8.8 · Published 2026-06-14

A security vulnerability exists in the GL.iNet GL-MT3000 wireless router, specifically within its firmware update mechanism. An attacker can remotely inject malicious commands into the device, potentially leading to a complete takeover of the router. This could allow an unauthorized user to intercept network traffic, disrupt internet connectivity, or use the device as a foothold for further attacks on the local network.

Technologies: GL.iNet GL-MT3000. Vendors: GL.iNet.

Quick answers

Is CVE-2026-12187 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-12187 being exploited in the wild.
How severe is CVE-2026-12187?: High severity, with a CVSS score of 8.8, published 14 June 2026.
Which products and versions are affected?: GL.iNet GL-MT3000 up to 4.4.5.
Is there a fix for CVE-2026-12187?: A patch was published on 2026-06-14: Vendor released version 4.7 to address the issue. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-12187 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-12187?: Check whether you run GL.iNet GL-MT3000 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A command injection vulnerability exists in the GL.iNet GL-MT3000 router within the '/usr/bin/one_click_upgrade' file, which is part of the Online Firmware Upgrade Handler component. The flaw stems from improper neutralization of special elements (CWE-74, CWE-77) during the processing of upgrade requests. A remote attacker with low-level privileges can exploit this by sending crafted inputs to the upgrade handler, leading to arbitrary command execution on the underlying operating system. The exploit has been disclosed publicly. Users are advised to upgrade to firmware version 4.7 or later to mitigate this risk.

Affected products

GL.iNet GL-MT3000 up to 4.4.5

Timeline

2026-06-14: disclosed: Public disclosure of the vulnerability and exploit details.
2026-06-14: advisory
2026-06-14: patched: Vendor released version 4.7 to address the issue.

References

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.