CVE-2025-55321

Name: CVE-2025-55321
Creator: NVD / NIST
Published: 2025-10-09T21:15:37.89+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.3/10EPSS 0.40%

Last modified Jun 17, 2026

CVE-2025-55321 is a critical-severity vulnerability rated 9.3/10 on the CVSS scale. Improper neutralization of input during web page generation ('cross-site scripting') in Azure Monitor allows an unauthorized attacker to perform spoofing over a network.. EPSS estimates a 0.40% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.3/10

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

EPSS Probability

0.40%

32.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Microsoft	Azure Monitor	All versions

References

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

Timeline

Published: Oct 9, 2025
Last Modified: Jun 17, 2026
Status: Modified

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.

How severe is CVE-2025-55321?

CVE-2025-55321 has a CVSS score of 9.3/10 (CRITICAL severity). The EPSS model estimates a 0.40% probability of exploitation in the next 30 days.

How do I fix CVE-2025-55321?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-55321?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST