CVE-2026-11429Network attack vector

Unauthenticated code execution via unvalidated upload paths

Published Jun 5, 2026 · Updated Jun 5, 2026

Path traversal in Altium Enterprise Server before 8.1.1 and Altium 365 allows remote attackers to execute code via file upload. Two Vault Service ScriptsController endpoints construct destination paths from an upload filename without validation and write the file before checking authentication. No credentials, session, or user interaction is required, and attacker-controlled content executes under the Vault Service account.

CVSS severity10.0
Critical
EPSS probability1.15%
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 Enterprise Server before 8.1.1 and Altium 365 allows remote attackers to execute code via file upload. Two Vault Service ScriptsController endpoints construct destination paths from an upload filename without validation and write the file before checking authentication. No credentials, session, or user interaction is required, and attacker-controlled content executes under the Vault Service account.

The record

CVE
CVE-2026-11429
Published
Jun 5, 2026
Updated
Jun 5, 2026
Vendor
Altium
Product
Altium 365
Classifications
CWE-306, CWE-22, T1190
Attack vector
network
Privileges
unauthenticated

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?

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  1. Affected versionversion=unspecified

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Altium · Altium 365version=unspecified
Altium · Altium On-Prem Enterprise Serverversion=0 <8.1.1

Published CVSS scores

10.0AltiumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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