CVE-2026-11419Network attack vector

Authenticated arbitrary file write via absolute upload path

Published Jun 5, 2026 · Updated Jun 5, 2026

Path traversal in Altium On-Prem Enterprise Server before 8.1.1 allows remote authenticated users to write files via image uploads. Vault Service UploadController accepts an absolute user-controlled path component, causing path combination to discard the configured storage root and write content anywhere the service account permits. A regular workspace account is sufficient, and writes to web directories, binaries, or configuration can enable code execution, service takeover, or a service interrupt.

CVSS severity9.4
Critical
EPSS probability0.55%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in Altium On-Prem Enterprise Server before 8.1.1 allows remote authenticated users to write files via image uploads. Vault Service UploadController accepts an absolute user-controlled path component, causing path combination to discard the configured storage root and write content anywhere the service account permits. A regular workspace account is sufficient, and writes to web directories, binaries, or configuration can enable code execution, service takeover, or a service interrupt.

The record

CVE
CVE-2026-11419
Published
Jun 5, 2026
Updated
Jun 5, 2026
Vendor
Altium
Product
Altium On-Prem Enterprise Server
Classifications
CWE-22, CWE-434, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <8.1.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Altium · Altium On-Prem Enterprise Serverversion=0 <8.1.1

Published CVSS scores

8.8NISTCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
9.4AltiumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-434Unrestricted Upload of File with Dangerous Type
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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