ConnectWise ScreenConnect: Schwachstelle ermöglicht Umgehen von Sicherheitsvorkehrungen und potenziell Privilegieneskalation
WID-SEC-2026-0763 · first 18.03.2026 · updated 18.03.2026 · CVSS 9,0
What it is about
ConnectWise ScreenConnect ist eine Softwarelösung für Fernzugriff, Fernsupport und Fernwartung von Computern, Servern, virtuellen Maschinen und mobilen Geräten. Ein entfernter, anonymer Angreifer kann eine Schwachstelle in ConnectWise ScreenConnect ausnutzen, um Sicherheitsvorkehrungen zu umgehen, und potenziell um seine Privilegien zu erhöhen.
Under what conditions?
Over the network and without logging in. This is the most dangerous combination: attackers can scan reachable devices automatically.
What can happen in the worst case
An attacker could use the vulnerability to
- Sicherheitsvorkehrungen zu umgehen
- potenziell um seine Privilegien zu erhöhen
Am I affected?
Affected according to the BSI:
- ConnectWise ScreenConnect <26.1
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
Update to at least:
- ConnectWise ScreenConnect 26.1
Is the vulnerability already being exploited?
None of the CVEs is in the CISA catalogue of exploited vulnerabilities. That does not mean there are no attacks, only that none are documented.
Information and sources
- Original BSI advisory (WID)
- ConnectWise Security Bulletin vom 2026-03-17 www.connectwise.com
- EU Vulnerability Database vom 2026-03-17 euvd.enisa.europa.eu
CVE: CVE-2026-3564
Source: BSI warning and information service (CERT-Bund); CISA. The assessment of the conditions is my reading of the BSI text; the external pages are in their original language.