Critical ScreenConnect Vulnerability Allows Configuration Data Exposure and Untrusted Extension Installation
ConnectWise released a security update for ScreenConnect to address a critical vulnerability, tracked as CVE-2025-14265, which affects the server component of the remote access platform. The flaw, caused by improper code integrity validation during extension installations (CWE-494), could allow attackers with authorized or administrative access to expose sensitive configuration data and install untrusted extensions. The vulnerability carries a CVSS 3.1 base score of 9.1, highlighting its severity, though ConnectWise reports no evidence of active exploitation at this time. The issue impacts all ScreenConnect versions prior to 25.8, and the 25.8 patch enforces stricter server-side validation and integrity checks for extension installations.
ConnectWise has automatically applied updates to cloud-hosted ScreenConnect instances, while on-premises users must manually upgrade to version 25.8. Partners using Automate integration are advised to update their Automate ScreenConnect Extension before upgrading ScreenConnect itself. Security advisories from both ConnectWise and the Canadian Centre for Cyber Security urge organizations to prioritize patching to prevent potential unauthorized access and maintain secure remote management environments. The vulnerability is rated as Priority 2 – Moderate, with a recommended update window of 30 days, but immediate action is encouraged due to the risk of sensitive data exposure.
Timeline
Dec 16, 2025
Public reporting details impact and severity of the ScreenConnect flaw
By 2025-12-16, public reporting described CVE-2025-14265 as a critical issue with a CVSS score of 9.1, caused by improper code integrity validation during extension installation. Reports noted there was no evidence of active exploitation, but warned the bug could enable configuration exposure and untrusted extension installation.
Dec 11, 2025
ConnectWise releases ScreenConnect 25.8 security update
As part of the advisory, ConnectWise issued a security update for the ScreenConnect server component to remediate the vulnerability in versions prior to 25.8. Organizations, especially those running on-premises deployments, were urged to apply the update promptly.
Dec 11, 2025
ConnectWise discloses ScreenConnect vulnerability CVE-2025-14265
On 2025-12-11, ConnectWise released a security advisory for a critical ScreenConnect vulnerability, CVE-2025-14265, affecting all versions prior to 25.8. The flaw can expose sensitive configuration data and allow installation of untrusted extensions.
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