CVE-2026-84869: ConnectWise ScreenConnect Improper Privilege Management and Missing Authorization Vulnerability

Should you act?

Exploited: patch now if you run it

CISA has confirmed exploitation in the wild. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.

• Yes, if you run ConnectWise ScreenConnect. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2026-09-11, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2026-09-14; treat that as the outer limit, not the target.
• EPSS 0.9%, percentile 60: FIRST’s model estimates a 0.9% chance of exploitation activity in the next 30 days, higher than 60% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
• Needs an account (low (any account)). Exposure depends on who can log in.
• Editorial verdict: Act now. ScreenConnect CVE-2026-84869: Guest-to-Host File Execution — If your technicians use a ScreenConnect client older than 26.6.5, a compromised machine they connect to can run code on theirs; upgrade on-premises servers and reinstall host clients now.

What it is

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.

CISA’s summary

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.

Weakness type: CWE-862, CWE-269.

Product: ConnectWise ScreenConnect · Assigned by: ConnectWise · Published: 2026-09-08

Affected and fixed versions

Severity scores

• Attack vector: network (remotely reachable)
• Attack complexity: low
• Privileges required: low (any account)
• User interaction: none
• Scope: changed (can affect other components)

CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.

Exploitation and urgency

• CISA KEV: added 2026-09-11; federal due date 2026-09-14. Known ransomware use: Unknown.
• CISA 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.
• CISA SSVC assessment: exploitation active, automatable no, technical impact total.
• FIRST EPSS (model of 2026-10-21): 0.92% probability of exploitation activity in the next 30 days; percentile 60.

Timeline

• 2026-09-03 — erroneo.us brief: ScreenConnect CVE-2026-84869: Guest-to-Host File Execution
• 2026-09-08 — CVE record published by ConnectWise
• 2026-09-11 — Added to CISA’s Known Exploited Vulnerabilities catalog
• 2026-09-12 — CVE record last updated
• 2026-09-14 — CISA remediation deadline for US federal agencies

Sources and references

Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.

Vendor and project advisories, patches

1. Listed in CISA KEV notes (connectwise.com) connectwise.com

Vulnerability records

1. CVE.org record CVE-2026-84869 cve.org
2. NVD entry CVE-2026-84869 nvd.nist.gov

Government

1. CISA Known Exploited Vulnerabilities catalog entry cisa.gov
2. Listed in CISA KEV notes (cisa.gov) cisa.gov
3. Listed in CISA KEV notes (cisa.gov) cisa.gov

Other references from the CVE record and advisory

1. github.com github.com
2. connectwise.com connectwise.com
3. huntress.com huntress.com

All exploited ConnectWise vulnerabilities · Today’s Security Digest