{"id":"CVE-2026-84869","published":"2026-09-08T20:18:51Z","modified":"2026-09-12T04:16:42Z","title":"ConnectWise ScreenConnect Improper Privilege Management and Missing Authorization Vulnerability","vendor":"ConnectWise","product":"ScreenConnect","tier":"core","eol":null,"description":{"text":"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.","provenance":"source","from":"NVD"},"summary":{"text":"The ConnectWise ScreenConnect client contains an improper privilege management and missing authorization flaw that lets files be transferred and executed through an active remote session. An attacker who already has a low-privilege account and network access can, under certain circumstances, do this without authorization and without the Host confirming the action, and no user interaction is required; the ScreenConnect server itself is not affected.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-23T07:14:48Z"},"cvss":{"score":9.9,"severity":"CRITICAL","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","provenance":"source","from":"NVD"},"epss":{"score":0.00924,"percentile":0.60436,"date":"2026-10-31","provenance":"source"},"kev":{"dateAdded":"2026-09-11","dueDate":"2026-09-14","ransomware":false,"requiredAction":"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.","notes":"https://www.connectwise.com/company/trust/security-bulletins/2026-09-08-screenconnect-bulletin ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-84869","provenance":"source"},"vulncheckKev":{"dateAdded":"2026-09-08","exploitedFirstSeen":"2026-09-08","ransomware":false,"evidence":[{"url":"https://www.huntress.com/blog/rogue-screenconnect-installations","date":"2026-09-08"},{"url":"https://previdian.com/CVE-2026-84869","date":"2026-09-09"},{"url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","date":"2026-09-11"}],"evidenceTotal":3,"provenance":"source"},"exploited":true,"otx":null,"cwes":[{"id":"CWE-269","name":"Improper Privilege Management"},{"id":"CWE-862","name":"Missing Authorization"}],"references":[{"url":"https://github.com/ConnectWise-Advisories/Disclosures/tree/main/CVE-2026-84869","tags":["Third Party Advisory"]},{"url":"https://www.connectwise.com/company/trust/advisories","tags":["Vendor Advisory"]},{"url":"https://www.connectwise.com/company/trust/security-bulletins/2026-09-08-screenconnect-bulletin","tags":["Vendor Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-84869","tags":["US Government Resource"]},{"url":"https://www.huntress.com/blog/rogue-screenconnect-installations","tags":["Third Party Advisory"]}],"techniques":[{"id":"T1078","name":"Valid Accounts","tactics":["initial-access","persistence","privilege-escalation","stealth"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: Abuses authorized active remote session access","mappingType":"exploitation_technique","evidence":[{"from":"description","quote":"without authorization or Host confirmation in certain circumstances","start":120,"end":187}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"},{"id":"T1059","name":"Command and Scripting Interpreter","tactics":["execution"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: Transferred files are executed on the host","mappingType":"primary_impact","evidence":[{"from":"description","quote":"files to be transferred and executed through an active remote session","start":50,"end":119}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"},{"id":"T1105","name":"Ingress Tool Transfer","tactics":["command-and-control"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: File transfer into the host via session","mappingType":"primary_impact","evidence":[{"from":"description","quote":"files to be transferred and executed through an active remote session","start":50,"end":119}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"}],"reports":[],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2026-74053","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-74053","exploited":true,"exploitedSince":"2026-09-11","provenance":"source"},"exploits":[],"exploitSources":null,"exploitRefs":[],"flow":[{"stage":"exploitation","techniques":["T1078"],"provenance":"ai"},{"stage":"primary","techniques":["T1059","T1105"],"provenance":"ai"}],"timeline":[{"date":"2026-09-08","kind":"published","label":"Published (NVD)","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-84869","provenance":"source"},{"date":"2026-09-08","kind":"exploited-reported","label":"Exploitation first reported (VulnCheck KEV evidence)","url":"https://www.huntress.com/blog/rogue-screenconnect-installations","provenance":"source"},{"date":"2026-09-11","kind":"kev","label":"Added to CISA KEV","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","provenance":"source"},{"date":"2026-09-11","kind":"euvd-exploited","label":"ENISA EUVD: exploited","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-74053","provenance":"source"}],"speed":{"daysToPublicExploit":null,"firstExploitFrom":null,"daysToKev":3},"priority":{"score":64.0,"factors":[{"name":"In a KEV catalog","points":35.0,"detail":"listed in CISA KEV and VulnCheck KEV"},{"name":"Recent KEV listing","points":10.0,"detail":"added 54 days ago"},{"name":"Known ransomware use","points":0.0,"detail":"not known"},{"name":"EPSS percentile","points":12.09,"detail":"percentile 0.6044"},{"name":"Named in threat reports","points":0.0,"detail":"0 reports"},{"name":"Public exploit code","points":0.0,"detail":"none found"},{"name":"Mentioned in OTX pulses","points":0.0,"detail":"0 pulses"},{"name":"CVSS severity","points":6.93,"detail":"base score 9.9"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]}}