ScreenConnect Client: Guest-to-Host File Execution via File-Transfer Actions
Published Sep 8, 2026 ·Due Sep 14, 2026
9.9
CRITICALCVSS 3.1
EPSS 0.92%
Description
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.
Affected products
-
- Version All versions prior to 26.6.5StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| ConnectWise | ScreenConnect | unaffected |
|
- < 26.6.5.9742
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
Vendor solution
Cloud: Updated to the latest release. We recommend that partners reinstall their host clients https://docs.connectwise.com/ScreenConnect_Documentation/Get_started/Host_client/Reinstall_the_host_client and update their access agents https://docs.connectwise.com/ScreenConnect_Documentation/Get_started/Host_page/Reinstall_and_upgrade_an_access_agent .
On-prem: Upgrade to ScreenConnect client version 26.6.5 or later.
Automate-integrated ScreenConnect deployments: Automate partners are eligible to update their integrated on-premises ScreenConnect installation as long as their Automate Assurance subscription is active. Automate partners should apply the ScreenConnect 26.6.5 update through Automate Product Updates.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
Date Added
Sep 11, 2026
Patch Due
Sep 14, 2026
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 (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
ActiveAutomatable
NoTechnical Impact
TotalDecision
n/aAssessed Sep 11, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
Sep–Oct 2026- EPSS v5
Percentile over time
- EPSS v5
Table of values (2 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.92% (0.00924) | 58.99th | v5 (v2026.06.15) |
| Sep 9, 2026 | 0.38% (0.00382) | 31.60th | v5 (v2026.06.15) |
References (5)
- https://github.com/ConnectWise-Advisories/Disclosures/tree/main/CVE-2026-84869 Third Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-84869 government-resourceUS Government Resource
- https://www.connectwise.com/company/trust/advisories Vendor Advisory
- https://www.connectwise.com/company/trust/security-bulletins/2026-09-08-screenconnect-bulletin Vendor Advisory
- https://www.huntress.com/blog/rogue-screenconnect-installations third-party-advisoryThird Party Advisory
| Link | Providers | Tags |
|---|---|---|
| https://github.com/ConnectWise-Advisories/Disclosures/tree/main/CVE-2026-84869 | Third Party Advisory | |
| https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-84869 | government-resourceUS Government Resource | |
| https://www.connectwise.com/company/trust/advisories | Vendor Advisory | |
| https://www.connectwise.com/company/trust/security-bulletins/2026-09-08-screenconnect-bulletin | Vendor Advisory | |
| https://www.huntress.com/blog/rogue-screenconnect-installations | third-party-advisoryThird Party Advisory |
Change history (0)
No recorded changes yet.