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CVE-2026-25039
Published:July 20, 2026
Updated:August 06, 2026
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 Packages
https://github.com/Scille/parsec-cloud.git (GITHUB):
Affected version(s) >=v3.0.0 <v3.3.3-rc.0
Fix Suggestion:
Update to version v3.3.3-rc.0
parsec-cloud (PYTHON):
Affected version(s) >=0.5.0 <3.3.3rc0
Fix Suggestion:
Update to version 3.3.3rc0
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CVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
8.8
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Weakness Type (CWE)
Path Traversal: 'UNCsharename' (Windows UNC Share)
EPSS
Base Score:
0.34