CVE-2026-25085: Copeland Xweb 300d Pro Firmware

Critical severity, CVSS 9.8. EPSS: 0.5% chance of exploitation in the next 30 days.

A vulnerability exists in Copeland XWEB Pro version 1.12.1 and prior, in which an unexpected return value from the authentication routine is later on processed as a legitimate value, resulting in an authentication bypass.

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.