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CVE-2026-11420

CRITICAL
10.0
CVSS 4.0
Description
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.

Metadata

CVE ID
CVE-2026-11420
State
PUBLISHED
Assigner
Altium
Reserved
2026-06-05 19:57 UTC
Published
2026-06-05 20:03 UTC
Last updated
2026-06-05 20:29 UTC
Primary CWE
CWE-22
CWE-22 Improper Limitation of a Pathname to a Restricted Dir…
Vendor / Product
Altium / Altium Enterprise Server
Sources
cve.org  ·  NVD

Severity & Metrics

10.0 CRITICAL CVSS 4.0
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
SSVC — CISA Coordinator
Exploitation
none
Automatable
yes
Tech. Impact
total
Affected products (1)
VendorProductPlatformVersions
Altium Altium Enterprise Server Web 0 < 8.1.1
Weakness (CWE)
CWESourceDescription
CWE-22 cna CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-306 cna CWE-306 Missing authentication for critical function
CVSS scores (1)
ScoreSeverityVersionSourceVector
10.0 CRITICAL 4.0 cna 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
References (1)
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