CVE-2026-84869
ScreenConnect Client: Guest-to-Host File Execution via File-Transfer Actions
- Critical 9.9
- Exploited: added to CISA KEV 11 Sep 2026
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.
Key facts
- Published
- 8 Sep 2026
- Last changed
- 12 Sep 2026
- Assigned by
- ConnectWise
- KEV added
- 11 Sep 2026
- KEV fix due
- 14 Sep 2026
- EPSS
- 1.173% likely to be exploited in the next 30 days, higher than 67.982% of CVEs (scores for 15 Nov 2026)
- SSVC (CISA)
- Exploitation: active; Automatable: no; Technical impact: total
Severity scores
Each score is shown as its source gave it. They are not averaged or merged.
- 9.9CVSS 3.1, Criticalfrom the CNA (ConnectWise)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
What to do
- 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.CNA solution statement
- 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.CNA workaround statement
- 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.CISA KEV required action
Historical context and remediation
This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.
CAPEC-1 Accessing Functionality Not Properly Constrained by ACLs (CNA impact statement)
Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.
Affected products
| Vendor | Product | Versions |
|---|---|---|
| ConnectWise | ScreenConnect |
|
Timeline
- 8 Sep 2026 Published
- 11 Sep 2026 CVE-2026-84869 added to CISA KEV
- 11 Sep 2026 Added to the CISA KEV catalogue