Vulnerability · Published Jun 5, 2026 · Assigned by Altium
CVE-2026-11423Path Traversal in Altium Enterprise Server Collaboration Service Allows Privilege Escalation
Critical 9.4
In plain English
A critical-severity path traversal in Altium Enterprise Server from Altium. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 25% of all known vulnerabilities).
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Altium | Altium Enterprise Server | 0 – before 8.1.1 |
Weakness: CWE-22, CWE-269 · 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