TeamViewer users should patch five high‑severity flaws immediately
TeamViewer has issued updates that fix five high‑severity vulnerabilities in its remote‑access client and host software. The company recommends all users install version 15.82 immediately to eliminate the risk of remote code execution and privilege escalation.
Enterprises that depend on remote‑access software to support field staff, partners or customers must keep those tools up to date. TeamViewer has just released updates that close five high‑severity vulnerabilities affecting its Full Client and Host applications on Windows, Linux and macOS. The company urges every user to apply the fix without delay because, while no active exploitation has been observed, the flaws could allow an attacker to run code on a target system or to elevate privileges.
What’s affected
The advisory lists five distinct issues. Each one is rated high severity and has a unique CVE identifier. The table summarises the technical problem and the impact it could have if exploited.
| CVE | Type of flaw | Potential impact |
|---|---|---|
| CVE‑2026‑92370 | Remote‑session access‑control bypass | An unauthorised remote actor could execute code on the victim machine. |
| CVE‑2026‑19743 | Path‑traversal | An attacker could access files outside the intended directory, potentially leading to code execution. |
| CVE‑2026‑92368 | Heap‑based buffer overflow | Corrupt memory could be overwritten, allowing arbitrary code execution. |
| CVE‑2026‑92369 | TOCTOU race condition (time‑of‑check‑time‑of‑use) | A race could be abused to gain higher privileges or execute unwanted actions. |
| CVE‑2026‑92371 | Improper path validation | Local users could run code with the privileges of the current user or, in some cases, gain system‑level rights. |
Glossary, Remote code execution means an attacker can run commands on a computer from another location. Path‑traversal is a way to reach files or directories that should be off‑limits. Heap‑based buffer overflow corrupts a program’s memory area used for dynamic data. TOCTOU describes a timing gap where a check is performed and then the condition changes before use. Improper path validation is a failure to verify that a file path is safe before it is used.
Remediation
All five flaws are fixed in TeamViewer version 15.82 and in the supported maintenance and legacy releases. The vendor’s guidance is clear:
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- Download the latest client or host installer for your platform from the official TeamViewer download page.
- Run the installer and follow the on‑screen prompts to replace the existing version.
- Verify the installed version by opening TeamViewer, selecting Help → About, and confirming the number reads 15.82 (or a later maintenance build).
- If you run a legacy release, apply the corresponding maintenance update listed on the TeamViewer security bulletin.
- Restart the application and confirm connectivity to your devices.
TeamViewer states it is not aware of any public disclosure or active exploitation of these vulnerabilities. Nonetheless, the company’s history of being abused by ransomware operators makes prompt patching prudent.
Why act now?
Even without known exploits, high‑severity bugs are attractive targets for threat actors. An unpatched system could be compromised the moment an exploit is published. Updating now removes that attack surface and aligns your environment with the vendor’s security best practice.
What to check after updating
- Confirm that the version number matches the patched release.
- Review the TeamViewer log files for any unexpected connections.
- Ensure that remote‑access permissions are limited to authorised users only.
- Re‑evaluate any firewall rules that allow inbound TeamViewer traffic and tighten them where possible.
Staying on the latest version is the simplest way to keep remote‑access tools secure and to avoid becoming a foothold for ransomware or other malware.
This advisory is based on publicly released information from TeamViewer and independent reporting. No active exploitation has been observed at the time of writing.
