# CVE-2026-19976: COMFAST CF-N1-S mbox-config sub_44A968 command injection

> Remote attackers can execute arbitrary commands via the macaddress parameter in the mbox-config CGI script of COMFAST CF-N1-S routers.

- **Severity:** Medium 5.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 17 Aug 2026
- **Updated:** 17 Aug 2026
- **Also known as:** GHSA-24vp-g788-qg25

## What is CVE-2026-19976?

CVE-2026-19976 is a medium-severity command injection vulnerability in COMFAST CF-N1-S, published on 17 Aug 2026. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

A security vulnerability has been detected in COMFAST CF-N1-S 2.6.0.1. Impacted is the function sub_44A968 of the file /cgi-bin/mbox-config?method=SET&section=ptest_macaddress. Such manipulation of the argument macaddress leads to command injection. The attack may be launched remotely. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

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-2026-19976?


## How do I fix CVE-2026-19976?

No fix has been published for CVE-2026-19976 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-19976 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-19976 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-19976 and fix it if it is affected.

What it is: CVE-2026-19976 is a medium-severity command injection vulnerability in COMFAST CF-N1-S, published on 17 Aug 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-19976 exists.

Affected product: COMFAST CF-N1-S. 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-2026-19976/ (Markdown: https://insights.sbomify.com/CVE-2026-19976/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-19976
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-19976
- OSV: https://osv.dev/vulnerability/CVE-2026-19976

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-19976/
Summaries are generated and may contain mistakes; the official description above is the record.