Vulnerability · Published Jul 20, 2026 · Assigned by GitHub_M

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

High 8.8

In plain English

A high-severity security flaw in parsec-cloud from Scille. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 36% of all known vulnerabilities).

Severity (CVSS 3.1)8.8High

Exploit odds (30 days)0.4%top 64.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
Scille	parsec-cloud	< 3.3.3-rc.0

Weakness: CWE-40 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

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