CVE-2026-20945: Microsoft SharePoint Server 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 SharePoint Server 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 16.0.10417.20114Patch KB5002856 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.5548.1003Patch KB5002862 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.19725.20210Patch KB5002853
Event History
Frequently Asked Questions
What is the severity of CVE-2026-20945?
The CVE-2026-20945 is classified as a critical security vulnerability affecting Microsoft SharePoint Server.
How does CVE-2026-20945 affect users?
CVE-2026-20945 allows an authorized attacker to perform spoofing, potentially misleading users within the network.
How do I fix CVE-2026-20945?
To resolve CVE-2026-20945, apply the relevant security patches released by Microsoft for your version of SharePoint Server.
Which versions of Microsoft SharePoint are impacted by CVE-2026-20945?
CVE-2026-20945 affects various versions including Microsoft SharePoint Server, SharePoint Server Subscription Edition, SharePoint Server 2019, and SharePoint Enterprise Server 2016.
Is user interaction required for CVE-2026-20945 exploitation?
While an attacker must be authorized, they can exploit CVE-2026-20945 without requiring further user interaction.