CVE-2026-11419: Path Traversal in Altium Enterprise Server Vault UploadController Allows Arbitrary File Write
A path traversal vulnerability exists in the Altium Enterprise Server Vault Service UploadController due to improper validation of a user-controlled path component in image upload requests. An authenticated user can supply a crafted absolute path so that the configured storage root is discarded, allowing arbitrary files to be written to any location on the server filesystem writable by the service account.
Because content-controlled files can be written to web-accessible directories, or used to overwrite application binaries or configuration files, this can be escalated to remote code execution, service takeover, or denial of service. Altium 365 cloud deployments are not affected, as the affected endpoint is not reachable and the cloud storage architecture mitigates the file-write primitive.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Configuration
Block or restrict access to the Vault Service UploadController endpoint so it is not directly reachable from untrusted networks (for example, via firewall rules, network ACLs, or reverse proxy restrictions). Ensure the endpoint is only accessible to trusted administrators or internal systems.
Altium Enterprise Server Vault Service (UploadController) endpoint accessibility UploadController endpoint reachability = restricted / not reachable from untrusted networks - Configuration
Configure OS-level file system permissions so the Vault Service service account can write only to the intended storage root and necessary temporary directories. Revoke write permissions for the service account from web-accessible directories, application binaries, and configuration locations to prevent arbitrary file writes outside the intended storage area.
Altium Enterprise Server service account filesystem permissions write_permissions = restrict to required directories only - Compensating control
Use Altium 365 cloud deployments or equivalent architecture where the UploadController endpoint is not reachable and cloud storage mitigates the file-write primitive, if migration is an acceptable mitigation for your environment.
Event History
Frequently Asked Questions
What is the severity of CVE-2026-11419?
CVE-2026-11419 has a severity rating of 9.4, which is considered critical.
What type of vulnerability is CVE-2026-11419?
CVE-2026-11419 is classified as a path traversal vulnerability.
How can CVE-2026-11419 be exploited?
An attacker can exploit CVE-2026-11419 by manipulating image upload requests to perform arbitrary file writes.
How do I fix CVE-2026-11419?
To mitigate CVE-2026-11419, ensure that proper validation is implemented for user-controlled path components in upload requests.
Who is affected by CVE-2026-11419?
CVE-2026-11419 affects users of the Altium Enterprise Server Vault Service.