CVE-2026-11414: Unauthenticated File Exfiltration in Altium Enterprise Server Vault Service via Hard-coded Cryptographic Key and Path Traversal
A hard-coded cryptographic key is used by Altium Enterprise Server to sign file download URLs in the Vault service. Because the key is identical across all installations, an unauthenticated network attacker who can reach the server can forge valid download signatures and retrieve files from the Vault storage area without any authentication, session, or credentials.
A separate path traversal vulnerability in the same download endpoint allows the configured storage root to be escaped, enabling reads of arbitrary files on the server filesystem. Combined, these issues allow an unauthenticated attacker to obtain sensitive server configuration and key material, which can lead to full server compromise. The vulnerability can be chained with CVE-2026-9152 to enumerate and bulk-download stored content. Altium 365 cloud deployments are not impacted in practice, as file storage uses object storage rather than the local filesystem.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Configuration
Replace the hard-coded cryptographic key used to sign file download URLs with a unique per-installation key stored securely (e.g., in a secrets manager) and ensure download signatures are validated against the per-installation key.
Altium Enterprise Server Vault signing_key = unique per-installation (not hard-coded) - Configuration
Require authentication and valid session/credentials for file downloads (do not allow unauthenticated downloads), and validate signatures against the per-installation signing key.
Altium Enterprise Server Vault download endpoint authentication_required = true - Configuration
Use object storage rather than storing files on the local filesystem for Vault storage (Altium 365 cloud deployments use object storage and are not impacted), to eliminate filesystem path-traversal exposure.
Altium Enterprise Server Vault storage storage_backend = object storage (instead of local filesystem) - Compensating control
Restrict network reachability of the Altium Enterprise Server Vault service to trusted IPs/networks (firewall/ACL) to prevent unauthenticated remote access to the download endpoint.
- Compensating control
If immediate code fixes are not available, disable or block public access to the Vault download endpoint until mitigations (network restrictions, key replacement, authentication enforcement, or storage migration) are applied.
- Operational
Assume potential compromise of server configuration and key material: perform forensic review for signs of exfiltration, rotate any potentially exposed credentials/keys, and rebuild or restore impacted servers as necessary after remediation.
Event History
Frequently Asked Questions
What is the severity of CVE-2026-11414?
CVE-2026-11414 has a critical severity rating of 10, indicating a significant risk to systems.
How do I fix CVE-2026-11414?
To fix CVE-2026-11414, it is recommended to review and update the configuration of Altium Enterprise Server to eliminate the use of the hard-coded cryptographic key.
What software is affected by CVE-2026-11414?
CVE-2026-11414 affects Altium Enterprise Server, specifically its Vault service.
What type of vulnerability is CVE-2026-11414?
CVE-2026-11414 is classified as a path traversal vulnerability that allows unauthorized file exfiltration.
Can CVE-2026-11414 be exploited remotely?
Yes, CVE-2026-11414 can be exploited by unauthenticated network attackers who can reach the server.