CVE-2026-11420 CRITICAL

CVE-2026-11420: Path Traversal in Altium Enterprise Server NIS Allows Unauthenticated Arbitrary File Write and File Read

Vendor Altium
Product Altium Enterprise Server
Weakness CWE-22 · Path traversal
Published June 5, 2026
Last update June 5, 2026

CVSS base score

10.0/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality
Integrity

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

June 5, 2026 CVE published
June 5, 2026 Record updated