CVE-2025-55321 CRITICAL

CVE-2025-55321: Azure Monitor Log Analytics Spoofing Vulnerability

Vendor Microsoft

Product Azure Monitor

Weakness CWE-79 · XSS

Published October 9, 2025

Last update February 26, 2026

View on NVD All CVEs

CVSS base score

9.3/10

Attack vector Network

Attack complexity Low

Privileges required None

User interaction Required

Confidentiality High

Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N/E:U/RL:O/RC:C

What the vulnerability does

01Description

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

Key dates

02Disclosure timeline

October 9, 2025 CVE published

February 26, 2026 Record updated

External resources

03References

NVD — National Vulnerability Database https://nvd.nist.gov/vuln/detail/CVE-2025-55321 CWE — Common Weakness Enumeration https://cwe.mitre.org/data/definitions/79.html

Related vulnerabilities

04Related CVE

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