---
id: CVE-2026-85114
title: >-
  A vulnerability has been identified in .NET Client Library for SIMATIC S7
  Webserver API (All versions < V3.3.61)
summary: "A vulnerability has been identified in .NET Client Library for SIMATIC S7 Webserver API (All versions < V3.3.61). Affected applications do not properly validate filenames received from remote servers during ticket downloads.\r\n\r\nThis coul…"
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N'
cwe:
  - CWE-22
published: '2026-10-13'
updated: '2026-10-13'
sourceUpdated: '2026-10-13T10:17:20.640'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-85114'
references:
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-390352.html'
    label: productcert@siemens.com
tags:
  - nvd
ingestedAt: '2026-10-13T10:22:03.570Z'
---

## Overview

A vulnerability has been identified in .NET Client Library for SIMATIC S7 Webserver API (All versions < V3.3.61). Affected applications do not properly validate filenames received from remote servers during ticket downloads.

This could allow an attacker who can manipulate the ticket response to write arbitrary files outside the intended download directory and, when overwriting is enabled, replace existing files accessible to the application.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.