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Known exploited vulnerability

CVE-2026-84869

criticalCVSS 3.1 9.9In CISA KEVEPSS 0.92%Published · ConnectWise

The short answer

CVE-2026-84869 affects ConnectWise ScreenConnect and is rated critical (CVSS 9.9). CISA added it to the Known Exploited Vulnerabilities catalog on 2026-09-11: attackers are using it, so patch it first.

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.

Weakness: CWE-269, CWE-862.

Severity

9.9 critical

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Exploited (CISA KEV)

Yes, since Sep 11, 2026

Federal due date Sep 14, 2026

EPSS, next 30 days

0.92%

Higher than 61% of scored CVEs

How it can be exploited

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Changed
Confidentiality impact
High
Integrity impact
High
Availability impact
High

What CISA says to do

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…

Affected products

ScreenConnect. NVD's record lists the exact affected versions.

References

Questions

Is CVE-2026-84869 being exploited?

Yes. CISA added CVE-2026-84869 to its Known Exploited Vulnerabilities catalog on 2026-09-11, with a federal remediation due date of 2026-09-14.

How do I fix CVE-2026-84869?

CISA's 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…

From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.

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