CVE-2025-64672Network attack vector

Authenticated spoofing via improper output neutralization

Published Dec 9, 2025 · Updated Apr 16, 2026

Cross-site scripting in Microsoft SharePoint Server Subscription Edition before 16.0.19127.20378 allows remote authenticated users to spoof content. Microsoft identifies improper neutralization during web-page generation but has not disclosed the affected handler, input field, or rendering path. An authorized network user can reach the flaw; published sources do not establish whether another user's interaction is required or which data can be accessed.

CVSS severity8.8
High
EPSS probability1.02%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Microsoft SharePoint Server Subscription Edition before 16.0.19127.20378 allows remote authenticated users to spoof content. Microsoft identifies improper neutralization during web-page generation but has not disclosed the affected handler, input field, or rendering path. An authorized network user can reach the flaw; published sources do not establish whether another user's interaction is required or which data can be accessed.

The record

CVE
CVE-2025-64672
Published
Dec 9, 2025
Updated
Apr 16, 2026
Vendor
Microsoft
Product
Microsoft SharePoint Server Subscription Edition
Classifications
CWE-79
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 9, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 16, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=16.0.0 <16.0.19127.20378

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Microsoft · Microsoft SharePoint Server Subscription Editionversion=16.0.0 <16.0.19127.20378

Published CVSS scores

9.0NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
8.8Microsoft CorporationCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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