Full Report
Remote access software company TeamViewer warned customers on Tuesday to immediately patch a set of high-severity vulnerabilities affecting its client and host software. [...]
Analysis Summary
# Vulnerability: Multiple High-Severity Flaws in TeamViewer Client and Host Software
## CVE Details
- **CVE ID:** CVE-2026-92370, CVE-2026-19743, CVE-2026-92368, CVE-2026-92369, CVE-2026-92371
- **CVSS Score:** Not explicitly listed, but categorized by vendor as "High-Severity"
- **CWE:**
- CWE-284 (Improper Access Control)
- CWE-22 (Path Traversal)
- CWE-122 (Heap-based Buffer Overflow)
- CWE-367 (TOCTOU Race Condition)
- CWE-20 (Improper Path Validation)
## Affected Systems
- **Products:** TeamViewer Full Client and Host software.
- **Versions:** All versions prior to 15.82.
- **Configurations:** Windows, Linux, and macOS installations.
## Vulnerability Description
The primary flaw (**CVE-2026-92370**) involves an improper access control weakness that allows for a remote session access control bypass. This vulnerability enables a remote threat actor to perform unauthorized actions, which can ultimately lead to Remote Code Execution (RCE) on the target system.
The remaining vulnerabilities include a path traversal issue, a heap-based buffer overflow, a Time-of-Check Time-of-Use (TOCTOU) race condition, and improper path validation. These flaws allow local attackers to gain remote code execution or escalate privileges to the highest levels (NT AUTHORITY/SYSTEM on Windows or root on Linux/macOS).
## Exploitation
- **Status:** Not exploited (No evidence of active exploitation or public PoC at time of report).
- **Complexity:** Medium to High (Depending on the specific flaw, such as race conditions).
- **Attack Vector:** Network (for the session bypass) and Local (for privilege escalation flaws).
## Impact
- **Confidentiality:** High (Unauthorized access to remote sessions and files).
- **Integrity:** High (Ability to execute code and modify system files).
- **Availability:** High (Potential for system takeover or service disruption).
## Remediation
### Patches
- **Update to TeamViewer version 15.82** or later immediately.
- Supported maintenance and legacy releases have also received security updates; users should check their specific update channel for the latest version.
### Workarounds
- There are no specific technical workarounds provided; the vendor mandates an immediate update to the patched software versions.
## Detection
- **Indicators of Compromise:** Monitor for unusual remote session initiations or unauthorized administrative actions within TeamViewer logs.
- **Detection methods and tools:** Audit installed software versions across the enterprise to identify clients running versions lower than 15.82. Monitor for suspicious privilege escalation attempts (e.g., unexpected calls to NT AUTHORITY/SYSTEM).
## References
- Vendor Advisory: hxxps[:]//www[.]teamviewer[.]com/en/resources/security-advisories/ (General location)
- NVD - CVE-2026-92370: hxxps[:]//nvd[.]nist[.]gov/vuln/detail/cve-2026-92370
- Source Article: hxxps[:]//www[.]bleepingcomputer[.]com/news/security/teamviewer-urges-users-to-patch-severe-flaws-as-soon-as-possible/