---
id: CVE-2025-40903
title: >-
  A Stored HTML Injection vulnerability was discovered in the Schedule Restore
  Archive functionality due to improper validation of an input parameter
summary: >-
  A Stored HTML Injection vulnerability was discovered in the Schedule Restore
  Archive functionality due to improper validation of an input parameter. An
  authenticated user with administrative privileges can define a malicious
  restore sche…
severity: medium
cvss: 5.9
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:L'
cwe:
  - CWE-79
vendor: nozominetworks
product: cmc
affected:
  - cmc < 26.1.0
  - guardian < 26.1.0
patched:
  - cmc 26.1.0
  - guardian 26.1.0
published: '2026-05-19'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T13:10:00.187'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-40903'
references:
  - url: 'https://security.nozominetworks.com/NN-2026:6-01'
    label: prodsec@nozominetworks.com
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-827968.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
epss: 0.00194
epssPercentile: 0.08477
ingestedAt: '2026-10-14T13:30:58.502Z'
---

## Overview

A Stored HTML Injection vulnerability was discovered in the Schedule Restore Archive functionality due to improper validation of an input parameter. An authenticated user with administrative privileges can define a malicious restore schedule containing HTML tags. When a victim views the affected schedule, the injected HTML renders in their browser, enabling phishing and possibly open redirect attacks. Full XSS exploitation and direct information disclosure are prevented by the existing input validation and Content Security Policy configuration.

## Affected

- `cmc < 26.1.0`
- `guardian < 26.1.0`

## Remediation

Upgrade past the affected range:

- `cmc 26.1.0`
- `guardian 26.1.0`