Critical Vulnerability in ConnectWise ScreenConnect Enables Unauthorized File Transfers
ConnectWise has disclosed a serious vulnerability in its remote access product ScreenConnect that allows attackers to transfer and execute files from active remote sessions without requiring authorization or host-side confirmation.
The flaw, tracked as CVE-2026-84869, impacts both Support and Access session types and carries a CVSS v3.1 base score of 9.9, placing it in the Critical severity category. The company rated the issue as Important in its three-tier scale and assigned it the highest priority of High.
Exploitation of the vulnerability has already been confirmed in the wild, increasing the urgency for organizations using the product. ConnectWise published the security advisory on September 8, 2026, urging users to apply available mitigations promptly.
The vulnerability stems from improper handling in the file transfer process within the client component, enabling unauthorized actions under specific conditions during active remote sessions.
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