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

Source: https://junglewise.ai/threats/cve-2026-19976-comfast-cf-n1-s-command-injection-in-mbox-config  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-17. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-19976 · Severity: medium · CVSS 6.6 · Published 2026-08-17

COMFAST CF-N1-S is a network device used in IoT and home networking applications. A command injection vulnerability in the web configuration interface allows remote attackers to execute arbitrary commands on the device without authentication, potentially compromising the device and any network it protects.

Technologies: [Comfast CF-N1-S](https://junglewise.ai/threats/technologies/cf-n1-s). Vendors: [Comfast](https://junglewise.ai/threats/vendors/comfast).

## Quick answers

**Is CVE-2026-19976 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-19976 being exploited in the wild.

**How severe is CVE-2026-19976?** Medium severity, with a CVSS score of 6.6, published 17 August 2026.

**Which products and versions are affected?** Comfast CF-N1-S 2.6.0.1.

**Is there a fix for CVE-2026-19976?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-19976 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-19976?** Check whether you run Comfast CF-N1-S 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 /cgi-bin/mbox-config CGI script of COMFAST CF-N1-S firmware version 2.6.0.1, specifically in the function sub_44A968. The vulnerability occurs when unsanitized user input in the macaddress parameter is passed to the ptest_macaddress section. An attacker can inject arbitrary shell commands via the macaddress argument, which are executed with device privileges. The vulnerability is network-accessible and does not require prior authentication. Exploitation allows complete remote code execution on the affected device. The vendor has not released patches despite early notification.

## Affected products

- COMFAST CF-N1-S 2.6.0.1

## Timeline

- 2026-08-17: disclosed
- 2026-08-17: kev added: CVE-2026-19976

## References

- [https://github.com/1ChaoRen1/IOT/blob/main/CF-N1-S-V2.6.0.1%20.pdf](https://github.com/1ChaoRen1/IOT/blob/main/CF-N1-S-V2.6.0.1%20.pdf)
- [https://vuldb.com/cve/CVE-2026-19976](https://vuldb.com/cve/CVE-2026-19976)

## Related threats

- [Comfast CF-N1-S stack-based buffer overflow in web management](https://junglewise.ai/threats/cve-2026-94003-a-vulnerability-has-been-found-in-comfast-cf-n1-s-2-6-0-1)
- [Comfast CF-N1-S command injection in webmgnt](https://junglewise.ai/threats/cve-2026-75364-comfast-cf-n1-s-command-injection-in-webmgnt)
- [Comfast CF-N1-S stack buffer overflow in NTP timezone configuration](https://junglewise.ai/threats/cve-2026-78050-comfast-cf-n1-s-stack-buffer-overflow-in-ntp-timezone)
- [Comfast CF-N1-S command injection in NTP timezone](https://junglewise.ai/threats/cve-2026-77683-comfast-cf-n1-s-command-injection-in-ntp-timezone)
- [Comfast CF-N1-S stack-based buffer overflow in web management](https://junglewise.ai/threats/cve-2026-77148-comfast-cf-n1-s-stack-based-buffer-overflow-in-web-management)