Security tracker
CVE-2026-84869: ConnectWise ScreenConnect Improper Privilege Management and Missing Authorization Vulnerability
In short
ConnectWise ScreenConnect has a weakness classified as improper privilege management (CWE-269). CISA added it to its Known Exploited Vulnerabilities catalog on 2026-09-11. NVD lists CVSS 3.1 at 9.9 CRITICAL.
What it is
“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.” — CISA KEV, retrieved 2026-11-01
“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.” — NVD, retrieved 2026-11-01
Who is affected
ConnectWise ScreenConnect. NVD lists the following versions as affected:
- Versions before 26.6.5.9742
Exploitation status
CISA KEV added: 2026-09-11. Known ransomware campaign use: Not reported by CISA. Due date CISA set for US federal civilian agencies: 2026-09-14.
Timeline
| Date | Event |
|---|---|
| 2026-09-08T20:18:51.147 | NVD published |
| 2026-09-11 | CISA KEV added |
| 2026-09-12T04:16:42.757 | NVD last modified |
| 2026-09-14 | CISA KEV due |
| 2026-10-31 | FIRST EPSS score |
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 KEV
What to do
- Confirm whether you run ConnectWise ScreenConnect and which version.
- Apply the vendor update or mitigation in the advisory.
- Follow CISA’s required action.
- Review the vendor guidance on signs of compromise.
- Track the fix through completion.
References
- Third Party Advisory: https://github.com/ConnectWise-Advisories/Disclosures/tree/main/CVE-2026-84869
- Vendor Advisory: https://www.connectwise.com/company/trust/advisories
- Vendor Advisory: https://www.connectwise.com/company/trust/security-bulletins/2026-09-08-screenconnect-bulletin
- Third Party Advisory: https://www.huntress.com/blog/rogue-screenconnect-installations
- NVD detail
- CVE.org record
- CISA KEV catalog
Sources and dates
CISA Known Exploited Vulnerabilities Catalog, version 2026.10.30; retrieved 2026-11-01. CISA KEV data: CC0 1.0. No endorsement by CISA.
NVD retrieved: 2026-11-01. This product uses the NVD API but is not endorsed or certified by the NVD.
EPSS scores by FIRST; score date 2026-10-31.
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