CVE-2025-55321

CRITICAL

Published Oct 9, 2025 Modified Oct 23, 2025 CWE-79

Description

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

CVSS v3.1 Score

9.3

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N

Weakness Type (CWE)

CWE-79 Cross-site Scripting (XSS)

Affected Products

Vendor	Product	Versions
microsoft	azure_monitor	All

References

Advisories & Patches

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-55321

Frequently Asked Questions

What is CVE-2025-55321? +

Improper neutralization of input during web page generation ('cross-site scripting') in Azure Monitor allows an unauthorized attacker to perform spoofing over a network. It has a CVSS v3.1 base score of 9.3 (CRITICAL).

How severe is CVE-2025-55321? +

CVE-2025-55321 has a CVSS v3.1 score of 9.3 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately.

What products are affected by CVE-2025-55321? +

CVE-2025-55321 affects products from microsoft, specifically: azure_monitor. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-55321? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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