What’s Vulnerable › Vulnerabilities
CVE-2026-11423: Path Traversal in Altium Enterprise Server Collaboration Service Allows Privilege Escalation
- Severity: critical (CVSS 9.4 v4.0)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-06-05 · updated 2026-07-23
- Weakness: CWE-22
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
- Altium Enterprise Server: before 8.1.1 — fixed in 8.1.1
How to fix
Upgrade to a fixed version: Altium Enterprise Server 8.1.1. Check the vendor advisory for mitigations.
References
Get alerted when CVE-2026-11423 or the next vulnerability affects your stack