Vulnerability · Published Dec 11, 2025 · Assigned by ConnectWise
CVE-2025-14265Improper server-side validation in ScreenConnect extension framework
Critical 9.1
In plain English
A critical-severity security flaw in ScreenConnect from ConnectWise. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 31% of all known vulnerabilities).
Official description
In versions of ScreenConnect™ prior to 25.8, server-side validation and integrity checks within the extension subsystem could allow the installation and execution of untrusted or arbitrary extensions by authorized or administrative users. Abuse of this behavior could result in the execution of custom code on the server or unauthorized access to application configuration data. This issue affects only the ScreenConnect server component; host and guest clients are not impacted. ScreenConnect 25.8 introduces enhanced server-side configuration handling and integrity checks to ensure only trusted extensions can be installed.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| ConnectWise | ScreenConnect | All versions prior to 2025.8 |
Weakness: CWE-494 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H