CVE-2026-25039CWE-40

The application evaluate UNC path in workspace name

High · published July 20, 2026

CVSS v3.1
8.8
EPSS
1%
Percentile
43.9
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
8.8 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00548 · 43.9th percentile
Weakness
CWE-40 · Path Traversal: '\\UNC\share\name\' (Windows UNC Share)
Published
2026-07-20T14:53Z
EPSS history
Timeline
  • 20 JUL 14:53Z
    The application evaluate UNC path in workspace name
    cvelistv5