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CVE-2026-84869

CRITICAL 9.9 KNOWN EXPLOITED ALL-YEARS

Published 2026-09-08 · Last modified 2026-09-12 · ConnectWise · NVD: Analyzed

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.

ACTIVELY EXPLOITED

Confirmed exploited in the wild — in CISA KEV since 2026-09-11. Patch or mitigate now.

Exploitation likelihood

0.9%chance of exploitation in 30 days · 60th percentile

● In CISA KEV (2026-09-11)○ Catalogued PoC◆ SSVC: exploitation active, automatable no

Impact if exploited

9.9CVSS 3.1 · CRITICAL · CNA

  • ConfidentialityHigh
  • IntegrityHigh
  • AvailabilityHigh

What an attacker needs

  • ✓Access: Reachable over the network — no local access needed
  • ⚠Privileges: Requires a low-privilege account
  • ✓User interaction: No user interaction needed
  • ✓Complexity: No special conditions — reliably repeatable

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept

No public PoC is currently catalogued.

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Affected

Vendors Connectwise

Products Screenconnect

Weakness (CWE)

  • CWE-862: Missing Authorization
  • CWE-269: Improper Privilege Management

CVSS vector

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

References and research data (JSON)

Additional exploitation reports

Source-specific reports, separate from CISA KEV. Repeated observations from one source are not independent confirmations.

  • VulnCheck KEV · 2026-09-08T00:00:00Z

    Source guidance: 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.

    Source ransomware assessment: Unknown

    VulnCheck KEV · CVE-2026-84869 · Updated 2026-09-08T00:00:00Z
  • VulnCheck KEV · 2026-09-08T00:00:00ZVulnCheck KEV · CVE-2026-84869
  • VulnCheck KEV · 2026-09-09T00:00:00ZVulnCheck KEV · CVE-2026-84869
  • VulnCheck KEV · 2026-09-11T00:00:00ZVulnCheck KEV · CVE-2026-84869

Known Affected Software Configurations

VendorProductVersion range
ConnectwiseScreenconnect< 26.6.5.9742

All CVSS metrics

  • CRITICAL 9.9 v3.1 · CNA Primary
    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
  • CRITICAL 9.9 v3.1 · NVD Secondary
    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

References

Advisories

Technical & other

Sources: NVD · CVE.org · All sources and attribution · EPSS