# CVE-2026-1459: Command injection in VMG3625-T50B firmware

> An authenticated administrator can execute arbitrary OS commands via the certificate download CGI program in Zyxel VMG3625-T50B firmware.

- **Severity:** High 7.2 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 24 Feb 2026
- **Updated:** 26 Feb 2026
- **Also known as:** GHSA-x6c4-87pg-m84f

## What is CVE-2026-1459?

CVE-2026-1459 is a high-severity command injection vulnerability in Zyxel VMG3625-T50B firmware, published on 24 Feb 2026. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

A post-authentication command injection vulnerability in the TR-369 certificate download CGI program of the Zyxel VMG3625-T50B firmware versions through 5.50(ABPM.9.7)C0 could allow an authenticated attacker with administrator privileges to execute operating system (OS) commands on an affected device.

Weakness: CWE-78 (Improper Neutralization of Special Elements used in an OS Command)

## Which versions are affected by CVE-2026-1459?

It affects 6 products.


Products: Zyxel Dx5401-B1 Firmware, Zyxel Emg3525-T50b Firmware, Zyxel Emg5523-T50b Firmware, Zyxel Vmg3625-T50b Firmware, Zyxel Vmg3625-T50c Firmware, Zyxel Vmg8623-T50b Firmware.

## How do I fix CVE-2026-1459?

No fix has been published for CVE-2026-1459 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-1459 being exploited?

There is no known exploitation of CVE-2026-1459 in the wild and no public exploit code.

Public exploit code:

- POC for the CVE-2026-1459 which payload changes root SSH password. (github_poc): https://github.com/Toouch67/CVE-2026-1459-POC

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-1459 and fix it if it is affected.

What it is: CVE-2026-1459 is a high-severity command injection vulnerability in Zyxel VMG3625-T50B firmware, published on 24 Feb 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-1459 in the wild and no public exploit code.

Affected product: Zyxel VMG3625-T50B firmware. 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-2026-1459/ (Markdown: https://insights.sbomify.com/CVE-2026-1459/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-1459
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-1459
- OSV: https://osv.dev/vulnerability/CVE-2026-1459

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-1459/
Summaries are generated and may contain mistakes; the official description above is the record.