# CVE-2026-92369: TeamViewer Full Client and Host TOCTOU race condition in installer rollback

Source: https://junglewise.ai/threats/cve-2026-92369-teamviewer-full-client-and-host-prior-to-version-15-82-on-windows  
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-2026-92369 · Severity: high · CVSS 7.3 · Published 2026-09-29

TeamViewer's installation and update process on Windows uses a rollback mechanism that stores backup files in user-writable temporary directories. An attacker with local access can exploit a timing vulnerability to replace these backup files before they are restored by the installer running with elevated privileges, leading to privilege escalation to system level. This allows an attacker to take complete control of the affected computer.

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-2026-92369 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-92369 being exploited in the wild.

**How severe is CVE-2026-92369?** High severity, with a CVSS score of 7.3, published 29 September 2026.

**Which products and versions are affected?** Teamviewer Full Client prior to 15.82 on Windows; Teamviewer Host prior to 15.82 on Windows.

**Is there a fix for CVE-2026-92369?** 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-2026-92369 attacked?** It is attacked with local access, in a hosted service.

**Am I affected by CVE-2026-92369?** 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 TOCTOU race condition exists in the TeamViewer Windows installer rollback mechanism where elevated installer processes restore backup files from user-writable temporary directories without proper synchronization. An attacker can replace the backup files between the time the installer checks them and when they are restored, achieving arbitrary file placement with NT AUTHORITY/SYSTEM privileges. Exploitation requires successful timing of the race window and triggering a rollback during installation or update.

## Affected products

- TeamViewer Full Client prior to 15.82 on Windows
- TeamViewer Host prior to 15.82 on Windows

## 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)