CVE-2019-16517: ConnectWise Control

Critical severity, CVSS 9.8. EPSS: 1.3% chance of exploitation in the next 30 days.

An issue was discovered in ConnectWise Control (formerly known as ScreenConnect) 19.3.25270.7185. There is a CORS misconfiguration, which reflected the Origin provided by incoming requests. This allowed JavaScript running on any domain to interact with the server APIs and perform administrative actions, without the victim's knowledge.

Affected products

• ConnectWise Control: version 19.3.25270.7185 only

Published 2020-01-23. Last modified 2026-06-17.