Altium Enterprise Server up to 8.1.0 Network Installation Service path traversal

Summaryinfo

A vulnerability was found in Altium Enterprise Server up to 8.1.0. It has been rated as critical. The impacted element is an unknown function of the component Network Installation Service. Performing a manipulation results in path traversal. This vulnerability is identified as CVE-2026-11420. The attack can be initiated remotely. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as critical has been found in Altium Enterprise Server up to 8.1.0. This affects an unknown function of the component Network Installation Service. The manipulation with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Two path traversal vulnerabilities in the Network Installation Service (NIS) of Altium Enterprise Server allow an unauthenticated network attacker to write arbitrary files to any writable location on the server filesystem and to read package archive files from the server. No authentication, session, or credentials are required. Because content-controlled files can be written to web-accessible directories, or used to overwrite application binaries or configuration files, exploitation can be escalated to remote code execution in the context of the service account, and can disclose deployment package contents. Altium 365 cloud deployments are not affected, as the Network Installation Service is not part of the cloud offering.

The weakness was released by Joris Aerts with Tesla Inc.. It is possible to read the advisory at altium.com. This vulnerability is uniquely identified as CVE-2026-11420 since 06/05/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

Upgrading to version 8.1.1 eliminates this vulnerability.

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Productinfo

Vendor

• Altium

Name

• Enterprise Server

Version

• 8.0
• 8.1.0

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