What’s Vulnerable › Vulnerabilities
CVE-2026-92369: Time-of-check Time-of-use (TOCTOU) Race Condition in TeamViewer Windows Installer Rollback Mechanism Leads to Local Privilege Escalation
- Severity: high (CVSS 7.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.1% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-09-29 · updated 2026-09-30
- Weakness: CWE-367
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.
Affected products
- TeamViewer Full Client: from 15.0 before 15.82; from 15.64.0 (Legacy Windows 7 & 8) before 15.64.8 (Legacy Windows 7 & 8); from 14.7.0 before 14.7.48855; from 13.2.0 before 13.2.36230 — fixed in 13.2.36230, 14.7.48855, 15.64.8 (Legacy Windows 7 & 8), 15.82
- TeamViewer Host: from 15.0 before 15.82; from 15.64.0 (Legacy Windows 7 & 8) before 15.64.8 (Legacy Windows 7 & 8); from 14.7.0 before 14.7.48855; from 13.2.0 before 13.2.36230 — fixed in 13.2.36230, 14.7.48855, 15.64.8 (Legacy Windows 7 & 8), 15.82
How to fix
Upgrade to a fixed version: TeamViewer Full Client 13.2.36230, 14.7.48855, 15.64.8 (Legacy Windows 7 & 8), 15.82; TeamViewer Host 13.2.36230, 14.7.48855, 15.64.8 (Legacy Windows 7 & 8), 15.82. Check the vendor advisory for mitigations.
References
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