CVE-2026-20959CWE-79

Microsoft SharePoint Server Spoofing Vulnerability

Medium · published January 13, 2026

CVSS v3.1
4.6
EPSS
8%
Percentile
94.6
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
4.6 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C
CVSS v4.0
Not supplied
EPSS
0.07681 · 94.6th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-01-13T17:56Z
EPSS history
Timeline
  • 13 JAN 17:56Z
    Microsoft SharePoint Server Spoofing Vulnerability
    cvelistv5