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CVE-2026-64902

Microsoft SharePoint Server Spoofing Vulnerability

Published: Aug 11, 2026Updated: Aug 11, 2026 Sources: CVE List NVDCWE-79
4.6MEDIUM
NVD MITRE
EPSS Score
0.4%
Top 65.4%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

Description

Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.

In plain language

AI Act now

CVE-2026-64902 is a SharePoint flaw that lets a logged-in user inject malicious script into SharePoint pages, potentially tricking other people who view those pages; if you only have trusted accounts and no one is already compromised, the risk is lower, but it’s still worth patching.

Executive summary

CVE-2026-64902 is a spoofing-style web vulnerability (cross-site scripting, CWE-79) in Microsoft SharePoint Server products where an authorized user can inject script through a trusted interface so other users’ browsers execute it in their session.

If affected, business impact
Employee account/session spoofingCredentials and session theft riskManipulated SharePoint page contentBusiness data exposure risk

What to do now

  1. Check whether your Microsoft SharePoint Server (2016, 2019, or Subscription Edition) is installed and identify its current version.
  2. Confirm whether any non-admin or external users have access to create/edit content that can be rendered as web pages in SharePoint.
  3. If you use SharePoint with multiple contributors, assume the risk of malicious or compromised accounts and plan to patch.
  4. Upgrade SharePoint to the fixed versions: SharePoint Server 2016 → 16.0.5565.1001; SharePoint Server 2019 → 16.0.10417.20198; SharePoint Server Subscription Edition → 16.0.19725.20522.
Patch / advisory Usually a quick update

CVSS Vector Breakdown

AV:NAC:LPR:LUI:RS:UC:LI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-79

Affected Products

Microsoft
commercial·US
sharepoint serverOn-premWeb App
Enterprise Software / collaboration-groupware
Microsoft SharePoint Enterprise Server 2016On-premWeb App
Enterprise Software / itsm-monitoring
Microsoft SharePoint Server 2019On-premWeb App
Enterprise Software / itsm-monitoring
Microsoft SharePoint Server Subscription EditionOn-premWeb App
Enterprise Software / collaboration-groupware

Exploitability

Official Patch Available
Is your org exposed to CVE-2026-64902?We can run the check for you — a free external exposure review, no install. Check my exposure

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Execution
Initial Access
View detailed technique mapping

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64902
msrc.microsoft.com
News mentions
2

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