---
id: CVE-2025-55321
title: >-
  Improper neutralization of input during web page generation ('cross-site
  scripting') in Azure Monitor allows an unauthorized attacker to perform
  spoofing over a network.
summary: >-
  Improper neutralization of input during web page generation ('cross-site
  scripting') in Azure Monitor allows an unauthorized attacker to perform
  spoofing over a network.
severity: critical
cvss: 9.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N'
cwe:
  - CWE-79
vendor: microsoft
product: azure_monitor
affected:
  - azure_monitor
published: '2025-10-09'
updated: '2026-10-08'
sourceUpdated: '2026-10-08T13:10:00.200'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-55321'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-55321'
    label: secure@microsoft.com
tags:
  - nvd
epss: 0.00443
epssPercentile: 0.36485
ingestedAt: '2026-10-08T13:42:55.063Z'
---

## Overview

Improper neutralization of input during web page generation ('cross-site scripting') in Azure Monitor allows an unauthorized attacker to perform spoofing over a network.

## Affected

- `azure_monitor`

## Remediation

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