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CVE-2026-84869

critical

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.

References

https://www.huntress.com/blog/rogue-screenconnect-installations

https://github.com/ConnectWise-Advisories/Disclosures/tree/main/CVE-2026-84869

https://thehackernews.com/2026/11/sckit-malware-targets-screenconnect.html

https://www.huntress.com/blog/sckit-worm-rogue-screenconnect

https://www.bleepingcomputer.com/news/security/new-worm-like-sckit-malware-targets-msps-in-screenconnect-attacks/

https://therecord.media/connectwise-screenconnect-breaches-third-party-tool

https://cyberscoop.com/connectwise-screenconnect-sckit-attack/

https://www.bleepingcomputer.com/news/security/cisa-warns-of-hackers-exploiting-critical-screenconnect-flaw/

https://www.securityweek.com/connectwise-patches-screenconnect-vulnerability-exploited-in-worm-like-attacks/

https://securityaffairs.com/199032/security/u-s-cisa-adds-gitlab-jfrog-artifactory-and-connectwise-screenconnect-flaws-to-its-known-exploited-vulnerabilities-catalog.html

https://thehackernews.com/2026/09/cisa-adds-5-actively-exploited.html

https://www.cisa.gov/news-events/alerts/2026/09/11/cisa-adds-three-known-exploited-vulnerabilities-catalog

https://www.connectwise.com/company/trust/security-bulletins/2026-09-08-screenconnect-bulletin

https://www.connectwise.com/company/trust/advisories

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-84869

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-74053

Details

Source: Mitre, NVD

Published: 2026-09-08

Updated: 2026-09-12

Known Exploited Vulnerability (KEV)

Risk Information

CVSS v2

Base Score: 9

Vector: CVSS2#AV:N/AC:L/Au:S/C:C/I:C/A:C

Severity: High

CVSS v3

Base Score: 9.9

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

Severity: Critical

EPSS

EPSS: 0.01173

Vulnerability Watch

Tenable Research has classified this CVE under the following Vulnerability Watch classification, which includes active and historical (inactive) classifications. You can learn more about these classifications on our blog.

Vulnerability of Interest