# CVE-2026-16444: Improper Validation of File Paths in TeamViewer Desktop Clients

> An authenticated remote session participant can write files to unintended locations via path traversal, potentially achieving arbitrary code execution.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 26 Aug 2026
- **Updated:** 27 Aug 2026
- **Also known as:** GHSA-3mf4-g44r-xcvg

## What is CVE-2026-16444?

CVE-2026-16444 is a high-severity path traversal vulnerability in TeamViewer Full Client, Host, QuickSupport & Portable, published on 26 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

Improper
neutralization of path traversal sequences in TeamViewer Desktop Clients prior
Version 15.81.5 allows an authenticated remote session participant to write files
to unintended locations on the local file system via file transfer or virtual
file clipboard mechanisms. An attacker can leverage this behavior to achieve
arbitrary file write and potentially execute code with the privileges of the
affected user.

Weakness: CWE-73 (External Control of File Name or Path)

## Which versions are affected by CVE-2026-16444?


## How do I fix CVE-2026-16444?

No fix has been published for CVE-2026-16444 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-16444 being exploited?

There is no known exploitation of CVE-2026-16444 in the wild and no public exploit code.

Public exploit code:

- CVE-2026-16444 — Arbitrary file write on the controller via TeamViewer Classical File Transfer (TV-2026-1008) (github_poc): https://github.com/jamir0quai/CVE-2026-16444

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-16444 and fix it if it is affected.

What it is: CVE-2026-16444 is a high-severity path traversal vulnerability in TeamViewer Full Client, Host, QuickSupport & Portable, published on 26 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-16444 in the wild and no public exploit code.

Affected product: TeamViewer Full Client, Host, QuickSupport & Portable. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-16444/ (Markdown: https://insights.sbomify.com/CVE-2026-16444/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-16444
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-16444
- OSV: https://osv.dev/vulnerability/CVE-2026-16444

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-16444/
Summaries are generated and may contain mistakes; the official description above is the record.