Is CVE-2026-11556 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-11556 being exploited in the wild.

How severe is CVE-2026-11556?

High severity, with a CVSS score of 8.8, published 8 June 2026.

Is there a fix for CVE-2026-11556?

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-2026-11556 attacked?

It is attacked over the network, in device firmware.

Am I affected by CVE-2026-11556?

Check whether you run Tenda F451 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-2026-11556: Tenda F451 OS command injection in formWriteFacMac

CVE-2026-11556 · Severity: high · CVSS 8.8 · Published 2026-06-08

A security vulnerability has been identified in the Tenda F451 wireless router, a device used to provide internet connectivity for homes and small offices. An attacker can exploit this flaw to take complete control of the router by sending a specially crafted request to its web management interface. This could allow an unauthorized user to intercept network traffic, disrupt internet service, or use the compromised device as a foothold to attack other devices on the local network.

Technologies: Tenda F451. Vendors: Tenda.

Quick answers

Is CVE-2026-11556 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-11556 being exploited in the wild.
How severe is CVE-2026-11556?: High severity, with a CVSS score of 8.8, published 8 June 2026.
Which products and versions are affected?: Tenda F451 1.0.0.7, 1.0.0.9.
Is there a fix for CVE-2026-11556?: 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-2026-11556 attacked?: It is attacked over the network, in device firmware.
Am I affected by CVE-2026-11556?: Check whether you run Tenda F451 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

An OS command injection vulnerability exists in the Tenda F451 router (firmware versions V1.0.0.7 and V1.0.0.9) within the 'formWriteFacMac' function of the Web Management Interface. The vulnerability is located in the '/goform/WriteFacMac' endpoint, where the 'mac' parameter is processed without adequate sanitization. The user-supplied input is directly concatenated into a system command string via 'doSystemCmd', allowing an attacker to use shell metacharacters (e.g., ';', '&', '|') to execute arbitrary commands. Successful exploitation requires the attacker to be able to reach the web interface and typically requires low-level authentication, resulting in full Remote Code Execution (RCE) with root privileges. A public exploit (PoC) is available.

Affected products

Tenda F451 1.0.0.7, 1.0.0.9

Timeline

2026-06-08: disclosed: Initial disclosure and NVD publication
2026-06-08: advisory

References

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