CVE-2026-9102 CRITICAL

CVE-2026-9102: Path Traversal in Altium Enterprise Server ComparisonService Allows Arbitrary File Write

Vendor Altium
Product Altium Enterprise Server
Weakness CWE-22 · Path traversal
Published May 20, 2026
Last update May 20, 2026

CVSS base score

9.4/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality
Integrity

CVSS 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

What the vulnerability does

01Description

A path traversal vulnerability exists in the Altium Enterprise Server ComparisonService due to missing filename sanitization in the Gerber file upload APIs. A regular authenticated workspace user can supply a crafted filename in the multipart Content-Disposition header to escape the intended temporary upload directory and write arbitrary files to any location on the server filesystem. Because content-controlled files can be written to web-accessible directories, this can be escalated to remote code execution in the context of the service account. It can also be used to overwrite application binaries or configuration files, leading to service takeover or denial of service.

Key dates

02Disclosure timeline

May 20, 2026 CVE published
May 20, 2026 Record updated