CVE-2026-20959 — Cross-site Scripting in Microsoft Sharepoint Enterprise Server 2016

CWE-79 — Cross-site Scripting5 documents5 sources
Severity
5.4MEDIUMNVD
CNA4.6
EPSS
0.1%
top 81.12%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
4
Microsoft Sharepoint Enterprise Server 2016Microsoft Sharepoint Server 2019Microsoft Sharepoint Server Subscription Edition+1 more
Timeline
PublishedJan 13

Description

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.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:NExploitability: 2.3 | Impact: 2.7

Affected Packages4 packages

▶NVDmicrosoft/sharepoint_server< 16.0.19127.20442+2
▶CVEListV5microsoft/microsoft_sharepoint_server_201916.0.0 — 16.0.10417.20083
▶CVEListV5microsoft/microsoft_sharepoint_enterprise_server_201616.0.0 — 16.0.5535.1001
▶CVEListV5microsoft/microsoft_sharepoint_server_subscription_edition16.0.0 — 16.0.19127.20442

🔴Vulnerability Details

2
GHSA
GHSA-wvw4-rf55-ww3f: Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint allows an authorized attacker to p↗2026-01-13
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CVEList
Microsoft SharePoint Server Spoofing Vulnerability↗2026-01-13
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📋Vendor Advisories

1
Microsoft
Microsoft SharePoint Server Spoofing Vulnerability↗2026-01-13
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🕵️Threat Intelligence

1
Wiz
CVE-2026-20959 Impact, Exploitability, and Mitigation Steps | Wiz↗
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