CVE-2026-11419

Path Traversal in Altium Enterprise Server Vault UploadController Allows Arbitrary File Write

Published Jun 5, 2026 CVSS 4.0 · 9.4 Critical EPSS < 1% KEV · Not listed

Description

A path traversal vulnerability exists in the Altium Enterprise Server Vault Service UploadController due to improper validation of a user-controlled path component in image upload requests. An authenticated user can supply a crafted absolute path so that the configured storage root is discarded, allowing arbitrary files to be written to any location on the server filesystem writable by the service account.

Because content-controlled files can be written to web-accessible directories, or used to overwrite application binaries or configuration files, this can be escalated to remote code execution, service takeover, or denial of service. Altium 365 cloud deployments are not affected, as the affected endpoint is not reachable and the cloud storage architecture mitigates the file-write primitive.

Analysis

Technical impact

A path traversal flaw in the Altium Enterprise Server Vault Service UploadController allows an authenticated user to supply a crafted absolute path, causing the service to drop the configured storage root and write an arbitrary file anywhere on the server filesystem that the service account can reach. By overwriting web-accessible files, application binaries, or configuration files, an attacker can execute arbitrary code, take over the service, or deny service. The weakness maps to CWE-22 and CWE-434.

Affected Systems

The vulnerability affects Altium Enterprise Server, all iterations prior to the vendor’s published fix. Versions are not enumerated in the advisory, so any deployment that has exposed the UploadController endpoint is potentially vulnerable. The Altium 365 cloud service is not affected.

Risk and Exploitability

The CVSS score of 9.4 reflects a high severity risk. EPSS is not available, and the vulnerability is not listed in CISA’s KEV catalog. The attack requires authenticated access to the Vault Service, and the exploit path is the image upload endpoint. Because write permissions are available to the service account for arbitrary locations, a successful exploitation can lead to immediate service takeover or remote code execution.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Altium

Altium Enterprise Server

unaffected

Version	Status	Constraints
`0`	affected	< 8.1.1

Configuration 1 [-]

cpe:2.3:a:altium:on-prem_enterprise_server:*:*:*:*:*:*:*:*

No data.

Vendor Product Versions

Altium

Enterprise Server

Version	Status	Scheme	Platform
`[0,8.1.1)`	affected	semver	['web']

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

Apply the latest Altium Enterprise Server patch or update that addresses the UploadController path traversal issue.
Restrict file system permissions for the Altium service account so that it can write only to the intended storage root, removing write access to web-accessible directories and critical binaries.
Limit exposure of the Vault Service’s UploadController endpoint by firewalling, network segmentation, or restricting access to trusted administrators, and block unauthenticated or non‑trusted traffic.

Generated by OpenCVE AI on June 5, 2026 at 21:35 UTC.

Tracking

Advisories

No advisories available

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact High

Subsequent System Integrity Impact High

Subsequent System Availability Impact High

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.548% probability within 30 days)

Exploitation none

Automatable yes

Technical Impact total

References

Link	Providers
https://www.altium.com/platform/security-compliance/security-advisories

History

Jun 16, 2026 9:00 PM First appearance in the feed. Affected versions updated. Affected vendors updated. Scoring metrics updated View changes

Type	Values Removed	Values Added
First Time appeared		Altium on-prem Enterprise Server
CPEs		cpe:2.3:a:altium:on-prem_enterprise_server::::::::
Vendors & Products		Altium on-prem Enterprise Server
Metrics		cvssV3_1 `{'score': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}`

Jun 7, 2026 11:30 AM First appearance in the feed. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Altium Altium enterprise Server
Vendors & Products		Altium Altium enterprise Server

Jun 5, 2026 9:30 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}`

Jun 5, 2026 8:15 PM Description updated. Title updated. Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		A path traversal vulnerability exists in the Altium Enterprise Server Vault Service UploadController due to improper validation of a user-controlled path component in image upload requests. An authenticated user can supply a crafted absolute path so that the configured storage root is discarded, allowing arbitrary files to be written to any location on the server filesystem writable by the service account. Because content-controlled files can be written to web-accessible directories, or used to overwrite application binaries or configuration files, this can be escalated to remote code execution, service takeover, or denial of service. Altium 365 cloud deployments are not affected, as the affected endpoint is not reachable and the cloud storage architecture mitigates the file-write primitive.
Title		Path Traversal in Altium Enterprise Server Vault UploadController Allows Arbitrary File Write
Weaknesses		CWE-22 CWE-434
References		https://www.altium.com/platform/security-compliance/security-advisories
Metrics		cvssV4_0 `{'score': 9.4, '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'}`