Jan 2026: Microsoft SharePoint Server Spoofing Vulnerability
CVE-2026-20959 Published on January 13, 2026
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.
Weakness Type
What is a XSS Vulnerability?
The software does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
CVE-2026-20959 has been classified to as a XSS vulnerability or weakness.
Products Associated with CVE-2026-20959
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Affected Versions
Microsoft SharePoint Enterprise Server 2016:- Version 16.0.0 and below 16.0.5535.1001 is affected.
- Version 16.0.0 and below 16.0.10417.20083 is affected.
- Version 16.0.0 and below 16.0.19127.20442 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.