critical severityConfidence highHistorical record

ScreenConnect guest-to-host file execution (CISA KEV)

ConnectWise ScreenConnect clients before 26.6.5 can, under certain conditions, transfer and execute files through an active remote session without Host confirmation. CISA added CVE-2026-84869 to KEV. Upgrade to 26.6.5 or later and refresh Host clients / access agents.

Also tracked as CVE-2026-84869 · ScreenConnect guest-to-host file execution

First observed

Sep 8, 2026

Last observed

Sep 11, 2026

Last reviewed

Sep 20, 2026

Tracking ended

Sep 11, 2026

JSON recordArtifact CSVSTIX 2.1 bundle

Uncertainty and limitations

Read the evidence limits before acting on this record.

Exact session preconditions vary by client build; follow ConnectWise for Host client reinstall requirements beyond the server package bump.

  • ScreenConnect servers are not impacted per vendor; the client path is in scope.
  • CISA KEV listing confirms known exploitation interest; this campaign does not invent exploit details beyond public advisories.
  • HOL blog coverage is operator guidance, not a substitute for the vendor bulletin.

Timeline

Reviewed events, oldest first, each tied to a verified source.

  1. Disclosure

    CVE-2026-84869 disclosed for ScreenConnect client guest-to-host file execution.

  2. Update

    CISA listed CVE-2026-84869 in the Known Exploited Vulnerabilities catalog.

  3. Update

    HOL Guard published operator blog coverage for CVE-2026-84869.

Publication clock: 306.9 hours from reviewed disclosure timestamp to HOL publication; 12-hour critical target; historical backfill outside target.

Guard coverage and non-coverage

What Guard's reviewed coverage assertions do and do not claim for this campaign.

No Guard coverage mapping is published for this record.

Defensive policy guidance

Reviewed starting points for defending against this campaign's artifact classes.

No campaign-specific policy guidance is published.

Reviewed artifacts and indicators

Published values are defanged (for example hxxps and [.] blocks) so nothing here is copy-paste executable.

Reviewed artifacts

The specific artifacts this record concerns, as reviewed. Names and versions are shown as text; a registry link is not recorded here.

  • ScreenConnect@<26.6.5connectwisepackage

Sources

Every claim on this record is traceable to the sources below.

Reviewed in full by HOL Guard Security Publishing.

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Record HGTC-2026-8F3BA860.