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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-92369
StatePUBLISHED
AssignerTV
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-29 16:17:14 UTC
Updated2026-09-30 16:19:24 UTC
DescriptionTeamViewer 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.

Risk And Classification

Primary CVSS: v3.1 7.3 HIGH from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

Problem Types: CWE-367 | CWE-367 CWE-367 Time-of-check time-of-use (TOCTOU) race condition

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.3HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
3.1CNACVSS7.3HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA TeamViewer Full Client affected 15.0 15.82 custom Windows
CNA TeamViewer Full Client affected 15.64.0 (Legacy Windows 7 & 8) 15.64.8 (Legacy Windows 7 & 8) custom Windows
CNA TeamViewer Full Client affected 14.7.0 14.7.48855 custom Windows
CNA TeamViewer Full Client affected 13.2.0 13.2.36230 custom Windows
CNA TeamViewer Host affected 15.0 15.82 custom Windows
CNA TeamViewer Host affected 15.64.0 (Legacy Windows 7 & 8) 15.64.8 (Legacy Windows 7 & 8) custom Windows
CNA TeamViewer Host affected 14.7.0 14.7.48855 custom Windows
CNA TeamViewer Host affected 13.2.0 13.2.36230 custom Windows

References

ReferenceSourceLinkTags
www.teamviewer.com/en/resources/trust-center/security-bulletins/tv-2026-1010 [email protected] www.teamviewer.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: We thank Romain Igounet and Hugo Leclercq for the discovery and responsible disclosure. (en)

Additional Advisory Data

Solutions

CNA: Update to the latest version.

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