# CVE-2026-66050: NitroShare Desktop 0.3.4 Path Traversal via LAN File Transfer Server

> Unauthenticated attackers on the local network can write arbitrary files via path traversal, potentially achieving persistent code execution on the victim's machine.

- **Severity:** High 8.7 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 27 Jul 2026
- **Updated:** 27 Jul 2026
- **Also known as:** GHSA-5xhx-w5wq-c68v

## What is CVE-2026-66050?

CVE-2026-66050 is a high-severity path traversal vulnerability in nitroshare-desktop, published on 27 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

NitroShare Desktop through 0.3.4 contains a path traversal vulnerability in its LAN file transfer server that allows unauthenticated attackers on the same network to write arbitrary files by sending a crafted filename containing directory traversal sequences in the JSON item header name field. Attackers can exploit the lack of path validation to write files outside the transfer root directory to arbitrary locations the current user has write access, including the Windows Startup folder, enabling persistent code execution on the next user login.

Weakness: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2026-66050?


## How do I fix CVE-2026-66050?

No fix has been published for CVE-2026-66050 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-66050 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-66050 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-66050 and fix it if it is affected.

What it is: CVE-2026-66050 is a high-severity path traversal vulnerability in nitroshare-desktop, published on 27 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-66050 exists.

Affected product: nitroshare-desktop. 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-2026-66050/ (Markdown: https://insights.sbomify.com/CVE-2026-66050/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-66050
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-66050
- OSV: https://osv.dev/vulnerability/CVE-2026-66050

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-66050/
Summaries are generated and may contain mistakes; the official description above is the record.