CVE-2026-31255: Tenda AC18 Firmware

Critical severity, CVSS 9.8. EPSS: 1.5% chance of exploitation in the next 30 days.

A command injection vulnerability exists in Tenda AC18 V15.03.05.05_multi. The vulnerability is located in the /goform/SetSambaCfg interface, where improper handling of the guestuser parameter allows attackers to execute arbitrary system commands.

Affected products

• Tenda AC18 Firmware: version 15.03.05.05 only

Published 2026-04-27. Last modified 2026-06-17.