---
id: CVE-2026-25789
title: >-
  Affected devices do not properly validate and sanitize filenames on the
  Firmware Update page
summary: >-
  Affected devices do not properly validate and sanitize filenames on the
  Firmware Update page. This could allow a remote  attacker to social engineer
  the user into selecting the modified firmware file to be uploaded. This would
  result in …
severity: high
cvss: 7.1
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H'
cwe:
  - CWE-79
published: '2026-05-12'
updated: '2026-07-14'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-25789'
references:
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-688146.html'
    label: productcert@siemens.com
tags:
  - nvd
epss: 0.00473
epssPercentile: 0.38316
ingestedAt: '2026-07-14T10:36:25.557Z'
---

## Overview

Affected devices do not properly validate and sanitize filenames on the Firmware Update page. This could allow a remote  attacker to social engineer the user into selecting the modified firmware file to be uploaded. This would result in malitcious JavaScript execution in the context of the authenticated user's session without requiring the file to be uploaded, potentially leading to session hijacking or credential theft.

## Remediation

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