Is CVE-2026-8259 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-8259 being exploited in the wild.

How severe is CVE-2026-8259?

Medium severity, with a CVSS score of 4.7, published 11 May 2026.

Is there a fix for CVE-2026-8259?

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-2026-8259 attacked?

It is attacked over the network, in device firmware.

Am I affected by CVE-2026-8259?

Check whether you run Tenda AC6 or Tenda Ac6 Firmware 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-2026-8259: Tenda AC6 OS command injection in /goform/telnet

CVE-2026-8259 · Severity: medium · CVSS 4.7 · Published 2026-05-11

A vulnerability exists in the Tenda AC6 wireless router, a device used to provide Wi-Fi connectivity in homes and small offices. An attacker with administrative access can exploit this flaw to execute unauthorized system commands on the router. This could lead to a complete takeover of the device, allowing the attacker to intercept network traffic, change security settings, or use the router as a foothold for further attacks on the local network.

Technologies: Tenda AC6, Tenda Ac6 Firmware. Vendors: Tenda.

Quick answers

Is CVE-2026-8259 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-8259 being exploited in the wild.
How severe is CVE-2026-8259?: Medium severity, with a CVSS score of 4.7, published 11 May 2026.
Which products and versions are affected?: Tenda AC6 2.0/15.03.06.23.
Is there a fix for CVE-2026-8259?: 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-2026-8259 attacked?: It is attacked over the network, in device firmware.
Am I affected by CVE-2026-8259?: Check whether you run Tenda AC6 or Tenda Ac6 Firmware 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 TendaTelnet handler (0x45b860) within the /bin/httpd binary of Tenda AC6 V2.0 firmware V15.03.06.23. The application fails to sanitize the 'lan.ip' parameter received via the /goform/telnet endpoint before passing it to a system() call via doSystemCmd(). Specifically, the input is formatted into a 'telnetd -b %s &' string, allowing an attacker to use shell metacharacters (e.g., semicolons) to execute arbitrary commands. While remote exploitation is possible, it requires high privileges (administrative session) to access the vulnerable web form. A public proof-of-concept exists demonstrating the ability to read sensitive files like /etc/passwd.

Affected products

Tenda AC6 2.0/15.03.06.23

Timeline

2026-05-11: disclosed: Initial disclosure and NVD publication
2026-05-11: advisory

References

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