CVE-2026-84869ScreenConnect Client: Guest-to-Host File Execution via File-Transfer Actions
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.
Overview
Severity
| Score | Severity | Version | Vector String |
|---|---|---|---|
| 9.9 | CRITICAL | 3.1ConnectWise (CNA) | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |
CISA required action
⚡ Known exploited · remediation due Sep 14, 2026
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.
Details
- CVE ID
- CVE-2026-84869
- Status
- Analyzed
- Assigner (CNA)
- ConnectWise
- Published
- Sep 8, 2026
- Last modified
- 2026-09-12 04:16 UTC
Affected Products
As published by the CNA in the CVE record.
ConnectWiseScreenConnect1 version range
- All versions prior to 26.6.5
References
- github.com https://github.com/ConnectWise-Advisories/Disclosures/tree/main/CVE-2026-84869
- connectwise.com https://www.connectwise.com/company/trust/advisories
- connectwise.com https://www.connectwise.com/company/trust/security-bulletins/2026-09-08-screenconnect-bulletin
- cisa.gov https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-84869
- huntress.com https://www.huntress.com/blog/rogue-screenconnect-installations