CVE-2026-8265: Tenda AC6 OS command injection in get_log_file

CVE-2026-8265 · Severity: medium · CVSS 4.7 · Published 2026-05-11

A security 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 run unauthorized system commands on the router. This could lead to a complete takeover of the device, allowing the attacker to monitor network traffic, disrupt internet service, 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-2026-8265 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-8265 being exploited in the wild.
How severe is CVE-2026-8265?
Medium severity, with a CVSS score of 4.7, published 11 May 2026.
Which products and versions are affected?
Tenda AC6 15.03.06.23.
Is there a fix for CVE-2026-8265?
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-2026-8265 attacked?
It is attacked over the network, in device firmware.
Am I affected by CVE-2026-8265?
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 'get_log_file' function (offset 0x4462d0) within the '/bin/httpd' binary of Tenda AC6 V2.0 (AC1206) firmware version 15.03.06.23. The vulnerability is located in the handling of the '/goform/getLogFile' endpoint. The application retrieves the 'wans.flag' POST parameter using 'websGetVar()' and improperly incorporates it into a system call via 'doSystemCmd()' using a format string like 'echo "%s:" >> <logfile>'. An attacker can escape the double-quote context using shell metacharacters (e.g., '";id;"') to execute arbitrary OS commands. While the attack is reachable over the network, it requires high privileges (valid administrative session).

Affected products

  • Tenda AC6 (AC1206) 15.03.06.23

Timeline

  • 2026-05-11: disclosed: Public disclosure of the vulnerability and PoC
  • 2026-05-11: advisory: NVD publication date

References

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