CVE-2026-102859: Microsoft Office SharePoint Spoofing Vulnerability
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.
Other sources
Microsoft Office SharePoint Spoofing Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.20326.20190Patch KB5002927
Event History
Frequently Asked Questions
Who can exploit this issue?
An attacker must be authorized to access the affected SharePoint Server Subscription Edition environment. The attack can be performed over a network and requires user interaction.
What is the likely impact of successful exploitation?
The vulnerability is classified as a spoofing issue caused by cross-site scripting. The provided vector indicates low confidentiality and integrity impact, with no availability impact.
Is an unauthenticated attacker able to exploit this by default?
No. The supplied CVSS vector lists privileges required as low, so the attacker needs some level of authorization before attempting exploitation.