How severe is CVE-2026-20945?

CVE-2026-20945 has a CVSS 3.1 base score of 4.6 (MEDIUM). EPSS estimates a 19.1% probability of exploitation in the next 30 days.

CVE-2026-20945: Microsoft SharePoint Server Spoofing

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.

Severity

CVSS 3.1 · CNA4.6 MEDIUM

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

SSVC · CISA-ADP

Exploitationnone

Automatableno

Technical impactpartial

Affected Products

Vendor	Product	Affected versions
Microsoft	Microsoft SharePoint Enterprise Server 2016	16.0.0 to <16.0.5548.1003
Microsoft	Microsoft SharePoint Server 2019	16.0.0 to <16.0.10417.20114
Microsoft	Microsoft SharePoint Server Subscription Edition	16.0.0 to <16.0.19725.20210

References

1 Links

Vendor advisories

Microsoft SharePoint Server Spoofing Vulnerability

Record Details

Published

2026-04-14

Last updated

2026-09-25

Assigner (CNA)

microsoft

Credited to

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Related Tool Categories

Tool categories that test for or protect against this vulnerability class.

CWE-79 · Cross-site Scripting

Application Security Tools Penetration Testing Tools

CVE record data © The MITRE Corporation, used under the CVE Terms of Use. Exploited-in-the-wild data from the CISA Known Exploited Vulnerabilities catalog (CC0). Exploit prediction scores by FIRST EPSS (first.org/epss). This site is not endorsed or certified by MITRE, NVD, CISA, or FIRST.