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CVE-2026-64902: Microsoft SharePoint Server Spoofing Vulnerability

mediumCVSS 4.6CVE-2026-64902
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.

CSIRTS triage

vendor: Microsoftproduct: SharePoint ServerCross-site scripting
What
Cross-site scripting vulnerability in SharePoint web page generation enables spoofing.
Who is affected
Authorized users with network access to SharePoint deployments.
Urgency
Medium; CVSS 4.6 and authentication requirement limit immediate risk.
Action
Apply Microsoft SharePoint Server security update for CVE-2026-64902.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
medium — CVSS 4.6
Published
2026-08-11
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64902

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-64902coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for Microsoft SharePoint Server

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

More from Microsoft Security Response Center