ConnectWise ScreenConnect < 26.6.5 Missing Authorization

critical Nessus Plugin ID 344805

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Synopsis

A remote access application installed on the remote host is affected by a missing authorization vulnerability.

Description

According to its version, the ConnectWise ScreenConnect remote access software installed on the remote host is prior to 26.6.5. It is, therefore, affected by a missing authorization vulnerability:

- 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. (CVE-2026-84869)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade to ConnectWise ScreenConnect version 26.6.5 or later.

Plugin Details

Severity: Critical

ID: 344805

File Name: connectwise_screenconnect_26_6_5.nasl

Version: 1.3

Type: Local

Agent: windows, macosx, unix

Family: Misc.

Published: 9/11/2026

Updated: 9/15/2026

Configuration: Enable thorough checks (optional)

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Critical

Score: 9

Percentile: 99.76

CVSS v2

Risk Factor: High

Base Score: 9

Temporal Score: 7.4

Vector: CVSS2#AV:N/AC:L/Au:S/C:C/I:C/A:C

CVSS Score Source: CVE-2026-84869

CVSS v3

Risk Factor: Critical

Base Score: 9.9

Temporal Score: 9.2

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:F/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:connectwise:screenconnect

Required KB Items: installed_sw/ConnectWise ScreenConnect

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 9/8/2026

Vulnerability Publication Date: 9/8/2026

CISA Known Exploited Vulnerability Due Dates: 9/14/2026

Reference Information

CVE: CVE-2026-84869

IAVB: 2026-B-0254

Detections

Analytics