TeamViewer Clients: Mehrere Schwachstellen ermöglichen Ausführen von beliebigem Programmcode
WID-SEC-2026-3045 · first 27.08.2026 · updated 27.08.2026 · CVSS 8,8
What it is about
TeamViewer ist eine Fernzugriffs- und Fernsteuerungssoftware, die die Wartung von Computern und anderen Geräten ermöglicht. Ein Angreifer kann mehrere Schwachstellen in TeamViewer ausnutzen, um beliebigen Programmcode mit Benutzerrechten auszuführen.
Under what conditions?
The BSI does not name any particular preconditions. Exploitable remotely according to the BSI.
What can happen in the worst case
An attacker could use the vulnerability to
- beliebigen Programmcode mit Benutzerrechten auszuführen
Am I affected?
Affected according to the BSI:
- TeamViewer TeamViewer Full Client <15.81.5
- TeamViewer TeamViewer Host <15.81.5
- TeamViewer TeamViewer QuickSupport <15.81.5
- TeamViewer TeamViewer Legacy Versions
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
Update to at least:
- TeamViewer TeamViewer Full Client 15.81.5
- TeamViewer TeamViewer Host 15.81.5
- TeamViewer TeamViewer QuickSupport 15.81.5
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)
- TeamViewer Security Bulletin TV-2026-1008 vom 2026-08-25 www.teamviewer.com
- TeamViewer Security Bulletin TV-2026-1009 vom 2026-08-25 www.teamviewer.com
CVE: CVE-2026-16444, CVE-2026-19042
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.