Vulnerability · Published May 20, 2026 · Assigned by Altium
CVE-2026-9129Path Traversal in Altium Enterprise Server Viewer StorageController Allows Arbitrary File Read
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 0.2% (higher than 15% of all known vulnerabilities).
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Altium | Altium Enterprise Server | 0 – before 8.0.4 |
Weakness: CWE-22, CWE-200 · 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