CVE-2026-11423 CRITICAL

CVE-2026-11423: Path Traversal in Altium Enterprise Server Collaboration Service Allows Privilege Escalation

Vendor Altium
Product Altium Enterprise Server
Weakness CWE-22 · Path traversal
Published June 5, 2026
Last update June 8, 2026

CVSS base score

9.4/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality
Integrity

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

What the vulnerability does

01Description

A path traversal vulnerability exists in the Altium Enterprise Server Collaboration Service due to improper handling of user-supplied filenames in the MCAD and Simulation file download flows. A regular authenticated user can submit a collaboration message containing a crafted filename, which is later used to construct the download path on the server without validation, allowing arbitrary files to be read from the server filesystem. Because the readable files include the server's master configuration, which stores credentials for privileged accounts, exploitation can lead to authenticating as a system administrator and gaining full control of the server. Altium 365 cloud deployments are not affected.

Key dates

02Disclosure timeline

June 5, 2026 CVE published
June 8, 2026 Record updated