CVE-2026-84869
KEV: known exploited SSVC: activeScreenConnect Client: Guest-to-Host File Execution via File-Transfer Actions
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Attack conditions and impact
Derived from the CNA (via NVD) CVSS 3.1 vector| Metric | Value | Meaning |
|---|---|---|
| Attack vector AV | N | Network |
| Attack complexity AC | L | Low (easy) |
| Privileges required PR | L | Regular user |
| User interaction UI | N | None |
| Scope S | C | Changed (affects other components) |
| Confidentiality C | H | High |
| Integrity I | H | High |
| Availability A | H | High |
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
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.
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.
CISA KEV entry
ConnectWise ScreenConnect Improper Privilege Management and Missing Authorization Vulnerability — ConnectWise / ScreenConnect
ConnectWise ScreenConnect contains both an improper privilege management and missing authorization vulnerability that may allow an attacker to transfer and execute files through an active remote session without authorization or host confirmation.
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.
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
CVSS assessments
| Provider | Version | Score | Vector |
|---|---|---|---|
| NVD / 7d616e1a-3288-43b1-a0dd-0a65d3e70a49 (Secondary) | 3.1 | 9.9 CRITICAL | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |
| CNA / ConnectWise | 3.1 | 9.9 CRITICAL | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |
Affected products and packages
CNA (CVE.org)
| Vendor | Product | Versions |
|---|---|---|
| ConnectWise | ScreenConnect | affected: All versions prior to 26.6.5 default: unaffected |
NVD CPE (1)
Show CPE list
| Vendor | Product | Range | CPE |
|---|---|---|---|
| connectwise | screenconnect | < 26.6.5.9742 | cpe:2.3:a:connectwise:screenconnect:*:*:*:*:*:*:*:* |
Linux distribution status
References (5)
- https://github.com/ConnectWise-Advisories/Disclosures/tree/main/CVE-2026-84869 NVD, CNA Third Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-84869 NVD, ADP CISA-ADP US Government Resourcegovernment-resource
- https://www.connectwise.com/company/trust/advisories NVD, CNA Vendor Advisory
- https://www.connectwise.com/company/trust/security-bulletins/2026-09-08-screenconnect-bulletin NVD, CNA Vendor Advisory
- https://www.huntress.com/blog/rogue-screenconnect-installations NVD, ADP CISA-ADP Third Party Advisorythird-party-advisory