# 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.

- **Severity:** High 8.7 (`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`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 14 Jun 2026
- **Updated:** 15 Jun 2026
- **Also known as:** GHSA-8rqp-5vg5-cv68

## 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.

Weakness: CWE-77 (Improper Neutralization of Special Elements used in a Command), CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component)

## 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.

## Is CVE-2026-12187 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-12187 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-12187 and fix it if it is affected.

What it is: 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.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-12187 exists.

Affected product: GL.iNet GL-MT3000. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-12187/ (Markdown: https://insights.sbomify.com/CVE-2026-12187/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-12187
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-12187
- OSV: https://osv.dev/vulnerability/CVE-2026-12187

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-12187/
Summaries are generated and may contain mistakes; the official description above is the record.