CVE-2026-84869
ScreenConnect Client: Guest-to-Host File Execution via File-Transfer Actions
02 Description
ScreenConnect Client: Guest-to-Host File Execution via File-Transfer Actions
03 Exploitation and scoring
- Exploitation
- Exploited in the wild. Listed in the CISA Known Exploited Vulnerabilities catalog on 2026-09-11. Federal remediation due 2026-09-14.
- SSVC decision
- ExploitationactiveCISA reports credible evidence of active exploitation.
- AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
- Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.
- EPSS probability
- 0.38% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Ranks above 31.6% of scored records. A rank, not a probability.
- NVD base score
- 9.9 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
- NVD analysis status
- Analyzed. NVD last modified this record on 2026-09-11.
- Red Hat severity
- No Red Hat rating. Red Hat rates the CVEs that affect its products.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2026-09-08 19:29Z3 DAYS AGO
- Last updated
- 2026-09-11 19:58Z8 HR AGO
- Reserved
- 2026-09-02
- Assigning CNA
- ConnectWise
- Record state
- PUBLISHED
- Severity
- Critical (CVSS 9.9)
- CNA CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
- Weaknesses
- Data version
- 5.2
- Document digest
- 0530d5a3d46e746ff4c226c66d33a03e72baf7606eb3268958996d6af76a5159
05 Affected products
06 References
- www.connectwise.comhttps://www.connectwise.com/company/trust/security-bulletins/2026-09-08-screenconnect-bulletin
- github.comhttps://github.com/ConnectWise-Advisories/Disclosures/tree/main/CVE-2026-84869
- www.connectwise.comhttps://www.connectwise.com/company/trust/advisories
- www.huntress.comhttps://www.huntress.com/blog/rogue-screenconnect-installations
- www.cisa.govhttps://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-84869
07 Remediation
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.