Persistent CSS Injection in TwinCAT 3 HMI Server by Admin

Publication date: 2026-01-20

Last updated on: 2026-02-12

Assigner: CERT VDE

Description

An high privileged remote attacker can inject arbitrary content into the custom CSS field on the affected devices due to improper neutralization of input during web page generation ('Cross-site Scripting').

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-01-20

Last Modified

2026-02-12

Generated

2026-07-06

AI Q&A

2026-01-20

EPSS Evaluated

2026-07-05

NVD

CVE-2025-41768

EUVD

EUVD-2026-3464

Affected Vendors & Products

Vendor	Product	Version / Range
beckhoff	twincat_3_hmi_server	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-79	The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Attack-Flow Graph

Executive Summary

This vulnerability allows an authenticated administrator on a TwinCAT 3 HMI Server instance to inject arbitrary content into the custom CSS field. This injected content is stored on the device and later displayed on the login page and error page.

Impact Analysis

The vulnerability can impact you by allowing an authenticated administrator to inject malicious content into the device's custom CSS field, which is then rendered on the login and error pages. This could lead to information disclosure or manipulation of the user interface, potentially misleading users or exposing sensitive information.

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