ScreenConnect Client: Guest-to-Host File Execution via File-Transfer Actions
Summary
| CVE | CVE-2026-84869 |
|---|---|
| State | PUBLISHED |
| Assigner | ConnectWise |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-09-08 20:18:51 UTC |
| Updated | 2026-09-12 04:16:42 UTC |
| Description | A condition in the ScreenConnect client may allow files to be transferred and executed through an active remote session without authorization or Host confirmation in certain circumstances. ScreenConnect servers are not impacted. |
Risk And Classification
Primary CVSS: v3.1 9.9 CRITICAL from 7d616e1a-3288-43b1-a0dd-0a65d3e70a49
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
EPSS: 0.009240000 probability, percentile 0.606470000 (date 2026-11-07)
CISA KEV: Listed on 2026-09-11; due 2026-09-14; ransomware use Unknown
Problem Types: CWE-269 | CWE-862 | CWE-862 CWE-862 Missing Authorization | CWE-269 CWE-269 Improper Privilege Management
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | 7d616e1a-3288-43b1-a0dd-0a65d3e70a49 | Secondary | 9.9 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |
| 3.1 | CNA | CVSS | 9.9 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |
CVSS v3.1 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CISA Known Exploited Vulnerability
| Vendor | ConnectWise |
|---|---|
| Product | ScreenConnect |
| Name | ConnectWise ScreenConnect Improper Privilege Management and Missing Authorization Vulnerability |
| Required Action | Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines. |
| Notes | https://www.connectwise.com/company/trust/security-bulletins/2026-09-08-screenconnect-bulletin ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-84869 |
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 26.6.5 | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| www.connectwise.com/company/trust/security-bulletins/2026-09-08-screenconnect-bul... | 7d616e1a-3288-43b1-a0dd-0a65d3e70a49 | www.connectwise.com | Vendor Advisory |
| www.huntress.com/blog/rogue-screenconnect-installations | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | www.huntress.com | Third Party Advisory |
| www.cisa.gov/known-exploited-vulnerabilities-catalog | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | www.cisa.gov | US Government Resource |
| www.connectwise.com/company/trust/advisories | 7d616e1a-3288-43b1-a0dd-0a65d3e70a49 | www.connectwise.com | Vendor Advisory |
| github.com/ConnectWise-Advisories/Disclosures/tree/main/CVE-2026-84869 | 7d616e1a-3288-43b1-a0dd-0a65d3e70a49 | github.com | Third Party Advisory |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
| CISA Known Exploited Vulnerabilities catalog | CISA | www.cisa.gov | kev |
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| ADP | 2026-09-11T00:00:00.000Z | CVE-2026-84869 added to CISA KEV |
Solutions
CNA: Cloud: Updated to the latest release. We recommend that partners reinstall their host clients https://docs.connectwise.com/ScreenConnect_Documentation/Get_started/Host_client/Reinstall_the_host_client and update their access agents https://docs.connectwise.com/ScreenConnect_Documentation/Get_started/Host_page/Reinstall_and_upgrade_an_access_agent . On-prem: Upgrade to ScreenConnect client version 26.6.5 or later. Automate-integrated ScreenConnect deployments: Automate partners are eligible to update their integrated on-premises ScreenConnect installation as long as their Automate Assurance subscription is active. Automate partners should apply the ScreenConnect 26.6.5 update through Automate Product Updates.
Workarounds
CNA: If you are unable to apply the update immediately due to maintenance windows or change-freeze policies, you can implement the following as a temporary mitigation to help reduce exposure until the update can be applied. This is not a substitute for installing the security update. * Navigate to the Administration > Security > Roles section. * Edit a role, review each session group that has permissions assigned to it, and deselect the TransferFiles permission if it is selected. * Save your changes. Repeat for each role.