CVE-2026-9129 Path Traversal in Altium Enterprise Server Viewer StorageController Allows Arbitrary File Read
Authenticated users can read arbitrary files on on-premise servers, exposing secrets and enabling full compromise.
- 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-2026-9129?
CVE-2026-9129 is a critical path traversal vulnerability in Altium Enterprise Server, published on 20 May 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 Viewer StorageController due to improper handling of file path route parameters. On on-premise deployments that use local filesystem storage, a regular authenticated user can supply a URL-encoded absolute path (such as an encoded drive letter) in a Viewer storage API request, causing the configured storage root to be discarded and allowing arbitrary files to be read from the server filesystem.
Because the readable files include the server's master configuration, which stores database credentials, signing key locations, certificate passwords, and OAuth secrets, exploitation can lead to disclosure of all server secrets and full compromise of the server and its data. Cloud deployments are not affected, as they use object storage and do not enable this component.
Which versions are affected by CVE-2026-9129?
How do I fix CVE-2026-9129?
No fix has been published for CVE-2026-9129 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-2026-9129 being exploited?
There is no known exploitation of CVE-2026-9129 in the wild and no public exploit code.
Sources
Also known as GHSA-3qfq-f4q6-pq76.