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

Critical 9.1 Published 11 Dec 2025 Updated 26 Feb 2026

Authorized users can install untrusted extensions to execute arbitrary code or access configuration data on the ScreenConnect server.

Exploited in the wild: Not known
Login needed: An administrator
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2025-14265?

CVE-2025-14265 is a critical code injection vulnerability in ConnectWise ScreenConnect, published on 11 Dec 2025. An attacker needs administrator access to exploit it, with no action from the victim.

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.

Weakness: CWE-494

Which versions are affected by CVE-2025-14265?

It affects 1 product.

Products include Connectwise Screenconnect.

How do I fix CVE-2025-14265?

No fix has been published for CVE-2025-14265 yet. Limit exposure of the affected software until one is available.

Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.

Is CVE-2025-14265 being exploited?

There is no known exploitation of CVE-2025-14265 in the wild and no public exploit code.

Sources

Also known as GHSA-3hj4-mq9q-jpmj.