Improper server-side validation in ScreenConnect extension framework
Summary
| CVE | CVE-2025-14265 |
|---|---|
| State | PUBLISHED |
| Assigner | ConnectWise |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2025-12-11 15:15:46 UTC |
| Updated | 2026-10-07 20:10:01 UTC |
| 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. |
Risk And Classification
Primary CVSS: v3.1 9.1 CRITICAL from 7d616e1a-3288-43b1-a0dd-0a65d3e70a49
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
EPSS: 0.003680000 probability, percentile 0.285890000 (date 2026-10-07)
Problem Types: CWE-494 | CWE-494 CWE-494 Download of Code Without Integrity Check
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | 7d616e1a-3288-43b1-a0dd-0a65d3e70a49 | Secondary | 9.1 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H |
| 3.1 | CNA | CVSS | 9.1 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H |
CVSS v3.1 Breakdown
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Application | Connectwise | Screenconnect | All | All | All | All |
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | ConnectWise | ScreenConnect | affected All versions prior to 2025.8 | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| www.connectwise.com/company/trust/security-bulletins/screenconnect-2025.8-securit... | 7d616e1a-3288-43b1-a0dd-0a65d3e70a49 | www.connectwise.com | Vendor Advisory |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Paul Whiting (Ultraviolet Cyber) (en)
Additional Advisory Data
Solutions
CNA: Cloud: No action is required. ScreenConnect servers hosted in “screenconnect.com” cloud (standalone and Automate/RMM integrated) or “hostedrmm.com” for Automate partners have been updated to remediate the issue. On-prem: * ScreenConnect Partners: Please upgrade to ScreenConnect version 25.8 and update your guest clients to the same version. Visit Download | ScreenConnect page to download and apply the update (access requires a valid on-premises license). * Automate On-Prem Partners with ScreenConnect Integration: Partners using an on-premises ScreenConnect installation integrated with Automate must ensure that the Automate ScreenConnect Extension is updated to version 4.4.0.16 before upgrading the ScreenConnect server to version 25.8. Once confirmed, visit the Automate Product Updates https://docs.connectwise.com/ConnectWise_Automate_Documentation/Automate_Product_Updates page to download and apply the ScreenConnect 25.8 update.