# CVE-2026-19743: TeamViewer Full Client and Host path traversal in IPC service

Source: https://junglewise.ai/threats/cve-2026-19743-improper-path-validation-in-the-local-ipc-service-of-teamviewer  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-29. Updated: 2026-09-29  
License: CC BY 4.0 with a link back

CVE-2026-19743 · Severity: high · CVSS 7.8 · Published 2026-09-29

TeamViewer's local inter-process communication (IPC) service on Windows, Linux, and macOS fails to properly validate file paths, allowing a logged-in user with basic privileges to write files with system-level permissions. An attacker could exploit this to gain complete control of a computer by executing code as the system administrator.

Technologies: [Teamviewer Full Client](https://junglewise.ai/threats/technologies/full-client), [Teamviewer Host](https://junglewise.ai/threats/technologies/teamviewer-host). Vendors: [Teamviewer](https://junglewise.ai/threats/vendors/teamviewer).

## Quick answers

**Is CVE-2026-19743 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-19743 being exploited in the wild.

**How severe is CVE-2026-19743?** High severity, with a CVSS score of 7.8, published 29 September 2026.

**Which products and versions are affected?** Teamviewer Full Client prior to 15.82; also affects legacy versions 15.64 (Windows), 14.7 (Windows, Linux), 13.2 (Windows, Linux); Teamviewer Host prior to 15.82; also affects legacy versions 15.64 (Windows), 14.7 (Windows, Linux), 13.2 (Windows, Linux).

**Is there a fix for CVE-2026-19743?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-19743 attacked?** It is attacked with local access, in a hosted service.

**Am I affected by CVE-2026-19743?** Check whether you run Teamviewer Full Client or Teamviewer Host at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A local authenticated user can send crafted IPC commands to manipulate file paths and perform arbitrary file writes with SYSTEM/root privileges. The vulnerability stems from improper path validation (CWE-22) in the IPC service daemon, allowing privilege escalation from a low-privileged local user to NT AUTHORITY/SYSTEM or root. This requires local network access and an authenticated user account.

## Affected products

- TeamViewer Full Client prior to 15.82; also affects legacy versions 15.64 (Windows), 14.7 (Windows, Linux), 13.2 (Windows, Linux)
- TeamViewer Host prior to 15.82; also affects legacy versions 15.64 (Windows), 14.7 (Windows, Linux), 13.2 (Windows, Linux)

## Timeline

- 2026-09-29: disclosed

## References

- [https://www.teamviewer.com/en/resources/trust-center/security-bulletins/tv-2026-1010/](https://www.teamviewer.com/en/resources/trust-center/security-bulletins/tv-2026-1010/)

## Related threats

- [TeamViewer improper IPC access control in Remote Management Monitoring](https://junglewise.ai/threats/cve-2026-92375-an-improper-access-control-vulnerability-in-the-ipc-communication)
- [TeamViewer Full Client and Host TOCTOU race condition in privilege helper](https://junglewise.ai/threats/cve-2026-92374-a-time-of-check-time-of-use-toctou-race-condition-combined-with)
- [TeamViewer Full Client out-of-bounds write in screen decoder](https://junglewise.ai/threats/cve-2026-92372-an-out-of-bounds-write-vulnerability-in-the-screen-image-decoder)
- [TeamViewer integer overflow in remote-control screen decompression](https://junglewise.ai/threats/cve-2026-111585-an-integer-overflow-in-the-remote-control-screen-processing)
- [TeamViewer Full Client access control bypass in session establishment](https://junglewise.ai/threats/cve-2026-92370-an-improper-access-control-vulnerability-in-teamviewer-full)