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CVE-2026-84869.

Severity, exploit probability and exploitation status for one vulnerability, drawn from NVD, FIRST EPSS and CISA's exploited catalogue.

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known exploited ConnectWise ScreenConnect Improper Privilege Management and Missing Authorization Vulnerability

Vendor / product: ConnectWise - ScreenConnect
Listed by CISA: 2026-09-11
Federal fix deadline: 2026-09-14 (passed)
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.

Scores

CVSS 3.1: 9.9 critical CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
EPSS: 0.69% estimated probability of exploitation in the next 30 days (higher than 51% of all CVEs)
Weakness class: CWE-269, CWE-862

ATT&CK techniques

inferred from weakness class no curated mapping exists for this CVE; these are the techniques typically seen with CWE-269, CWE-862 vulnerabilities

ReconnaissanceResource DevelopmentInitial Access ExecutionPersistencePrivilege Escalation StealthDefense ImpairmentCredential Access DiscoveryLateral MovementCollection Command and ControlExfiltrationImpact

T1190 Exploit Public-Facing Application

Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

Inferred from CWE-862.

T1190 on attack.mitre.org

T1059 Command and Scripting Interpreter

Execution

Adversaries may abuse command and script interpreters to execute commands, scripts, or binaries.

Inferred from CWE-269, CWE-862.

T1059 on attack.mitre.org

T1548 Abuse Elevation Control Mechanism

Privilege Escalation

Adversaries may circumvent mechanisms designed to control privilege elevation to gain higher-level permissions.

Inferred from CWE-269.

T1548 on attack.mitre.org

T1211 Exploitation for Stealth

Stealth

Adversaries may exploit vulnerabilities to evade detection by hiding activity, suppressing logging, or operating within trusted or unmonitored components.

Inferred from CWE-862.

T1211 on attack.mitre.org

T1056 Input Capture

Credential AccessCollection

Adversaries may use methods of capturing user input to obtain credentials or collect information.

Inferred from CWE-862.

T1056 on attack.mitre.org

T1082 System Information Discovery

Discovery

An adversary may attempt to get detailed information about the operating system and hardware, including version, patches, hotfixes, service packs, and architecture.

Inferred from CWE-862.

T1082 on attack.mitre.org

T1005 Data from Local System

Collection

Adversaries may search local system sources, such as file systems, configuration files, local databases, virtual machine files, or process memory, to find files of interest and sensitive data prior to Exfiltration.

Inferred from CWE-862.

T1005 on attack.mitre.org

T1105 Ingress Tool Transfer

Command and Control

Adversaries may transfer tools or other files from an external system into a compromised environment.

Inferred from CWE-862.

T1105 on attack.mitre.org

See these techniques on the full ATT&CK matrix.

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.

Published: 2026-09-08
Last modified: 2026-09-12
NVD status: Analyzed

References

Covered in Decrypted

The bill comes due for the SSO flaw that hit 138 companies (2026-09-13)

CVSS measures how bad exploitation would be; EPSS estimates how likely exploitation is within 30 days; the CISA listing means it is already happening. Read them together: a CVSS 9.8 with EPSS 0.04% is usually less urgent than a CVSS 7.2 on the exploited list. Data: NVD, FIRST EPSS, CISA KEV; detail is cached for a week, scores for a day. ATT&CK techniques come from the CTID KEV mappings project where a curated mapping exists, otherwise they are inferred from the weakness class and labelled as such. ATT&CK is a registered trademark of The MITRE Corporation. © 2026 The MITRE Corporation. This work is reproduced and distributed with the permission of The MITRE Corporation.