CVE-2026-20764: Copeland Xweb 300d Pro Firmware

High severity, CVSS 8.8. EPSS: 2% chance of exploitation in the next 30 days.

An OS command injection vulnerability exists in XWEB Pro version 1.12.1 and prior, enabling an authenticated attacker to achieve remote code execution on the system by providing malicious input via the device hostname configuration which is later processed during system setup, resulting in remote code execution.

Affected products

• Copeland Xweb 300d Pro Firmware: up to and including 1.12.1
• Copeland Xweb 500b Pro Firmware: up to and including 1.12.1
• Copeland Xweb 500d Pro Firmware: up to and including 1.12.1

Published 2026-02-27. Last modified 2026-06-17.