CVE-2026-11423 Path Traversal in Altium Enterprise Server Collaboration Service Allows Privilege Escalation
Authenticated users can exploit path traversal to read server configuration files, exposing credentials and enabling privilege escalation to administrator.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-11423?
CVE-2026-11423 is a critical path traversal vulnerability in Altium Enterprise Server, published on 5 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
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.
Which versions are affected by CVE-2026-11423?
How do I fix CVE-2026-11423?
No fix has been published for CVE-2026-11423 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-11423 being exploited?
There is no known exploitation of CVE-2026-11423 in the wild and no public exploit code.
Sources
Also known as GHSA-8mjc-gx82-2m9v.