MicrosoftRadarIndependent status for Microsoft services

Azure Monitor Log Analytics Spoofing Vulnerability

CVE-2025-55321 is a spoofing vulnerability in Azure Monitor (rated Critical, CVSS 9.3). Microsoft fixed it in the service; customers need to do nothing.

1 version

Facts

Microsoft id
CVE-2025-55321
Products
Azure Monitor
Severity
Critical
Impact
Spoofing
CVSS
9.3
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
Exploited
No
Publicly disclosed
No
Exploitability
Exploitation Less Likely
Customer action required
No
Release
2025-Oct
Assigned by
Microsoft
Weakness
CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
MSRC revision
1.0
Status pages
Azure Monitor status
First captured by us
(from our first import of this list)
Microsoft last modified
Source
Security updates · open the original at Microsoft

Microsoft's revision notes

  1. Revision 1.0, 2025-10-09: Information published.

Microsoft says

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

Security updates,

Read Microsoft's full post

What Microsoft changed

One version so far. If Microsoft edits it, each change shows here with what was removed and added.

  1. First version we captured ·

    The text as we first saw it

    Seen by us · Microsoft's timestamp · Microsoft's page

Other changes for Azure Monitor