ConnectWise Patches ScreenConnect Vulnerability Exploited in Worm-Like Attacks
ConnectWise patched critical ScreenConnect flaw CVE-2026-84869 (CVSS 9.9) exploited since August 20 in worm-like attacks; CISA added it to KEV.
ConnectWise released urgent patches for CVE-2026-84869 (CVSS 9.9), a missing authorization and improper privilege management flaw in ScreenConnect allowing file transfer and execution through active remote sessions without host confirmation. Huntress reported in-the-wild exploitation since August 20, with attackers using rogue ScreenConnect clients to push four VBScript files for persistence and worm-like propagation to other ScreenConnect clients. The flaw is fixed in ScreenConnect 26.6.5, with disabling the TransferFiles permission as a temporary mitigation. CISA added the CVE to its KEV catalog, requiring federal agencies to patch within three days under BOD 26-04.
- CVE-2026-84869 scores 9.9/10 and enables unauthorized file transfer and execution via active sessions
- Exploited in the wild since August 20 in worm-like attacks spreading between ScreenConnect clients
- Fixed in ScreenConnect 26.6.5; temporary mitigation is disabling TransferFiles permission
- CISA added to KEV catalog with three-day federal patching deadline
- CVEs
- CVE-2026-84869
Vulnerabilities mentioned
All| CVE | Vulnerability | CVSS | EPSS | Signals | Published |
|---|---|---|---|---|---|
| CVE-2026-84869 | Missing authorization in ScreenConnect client allows unauthorized file execution | 9.9 | <1% | KEV | KEV |
From the original article
2 min read at securityweek.com
The flaw allows attackers to send files and execute them without authorization through an active remote session. The post ConnectWise Patches ScreenConnect Vulnerability Exploited in Worm-Like Attacks appeared first on SecurityWeek.
By Ionut Arghire · securityweek.com
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