CVE-2026-11423
Path Traversal in Altium Enterprise Server Collaboration Service Allows Privilege Escalation
Description
A path traversal vulnerability exists in the Altium Enterprise Server Collaboration Service due to improper handling of user-supplied filenames in the MCAD and Simulation file download flows. A regular authenticated user can submit a collaboration message containing a crafted filename, which is later used to construct the download path on the server without validation, allowing arbitrary files to be read from the server filesystem. Because the readable files include the server's master configuration, which stores credentials for privileged accounts, exploitation can lead to authenticating as a system administrator and gaining full control of the server. Altium 365 cloud deployments are not affected.
INFO
Published Date :
June 5, 2026, 9:16 p.m.
Last Modified :
July 23, 2026, 7:10 a.m.
Remotely Exploit :
Yes !
Source :
4760f414-e1ae-4ff1-bdad-c7a9c3538b79
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 4.0 | CRITICAL | 4760f414-e1ae-4ff1-bdad-c7a9c3538b79 | ||||
| CVSS 4.0 | CRITICAL | 4760f414-e1ae-4ff1-bdad-c7a9c3538b79 |
Solution
- Apply vendor-supplied patches for Altium Enterprise Server.
- Review and validate all user input for file operations.
- Restrict access to sensitive configuration files.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-11423.
| URL | Resource |
|---|---|
| https://www.altium.com/platform/security-compliance/security-advisories |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-11423 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-11423
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-11423 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-11423 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Jul. 23, 2026
Action Type Old Value New Value Added Translation Title: Altium Enterprise Server de Altium, Description: Una vulnerabilidad de salto de ruta existe en el Servicio de Colaboración de Altium Enterprise Server debido al manejo inadecuado de nombres de archivo proporcionados por el usuario en los flujos de descarga de archivos MCAD y de Simulación. Un usuario autenticado regular puede enviar un mensaje de colaboración que contiene un nombre de archivo manipulado, que luego se utiliza para construir la ruta de descarga en el servidor sin validación, permitiendo que se lean archivos arbitrarios del sistema de archivos del servidor. Debido a que los archivos legibles incluyen la configuración maestra del servidor, que almacena credenciales para cuentas privilegiadas, la explotación puede llevar a autenticarse como administrador del sistema y obtener control total del servidor. Las implementaciones en la nube de Altium 365 no se ven afectadas. -
CVE Modified by 4760f414-e1ae-4ff1-bdad-c7a9c3538b79
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'Altium', 'modules': ['Collaboration Service (MCAD and Simulation download)'], 'product': 'Altium Enterprise Server', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '8.1.1', 'versionType': 'semver'}], 'platforms': ['Web'], 'defaultStatus': 'unaffected'}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-11423', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-06-08T13:10:22.677034Z'} -
New CVE Received by 4760f414-e1ae-4ff1-bdad-c7a9c3538b79
Jun. 05, 2026
Action Type Old Value New Value Added Description A path traversal vulnerability exists in the Altium Enterprise Server Collaboration Service due to improper handling of user-supplied filenames in the MCAD and Simulation file download flows. A regular authenticated user can submit a collaboration message containing a crafted filename, which is later used to construct the download path on the server without validation, allowing arbitrary files to be read from the server filesystem. Because the readable files include the server's master configuration, which stores credentials for privileged accounts, exploitation can lead to authenticating as a system administrator and gaining full control of the server. Altium 365 cloud deployments are not affected. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-22 Added CWE CWE-269 Added Reference https://www.altium.com/platform/security-compliance/security-advisories