CVE-2025-14265 CRITICAL

CVE-2025-14265: Improper server-side validation in ScreenConnect extension framework

Vendor Connectwise
Product ScreenConnect
Weakness CWE-494 · Download without integrity check
Published December 11, 2025
Last update February 26, 2026

CVSS base score

9.1/10
Attack vector Network
Attack complexity Low
Privileges required High
User interaction None
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

December 11, 2025 CVE published
February 26, 2026 Record updated