Medium severity · published Jan 13, 2026
CVE-2026-20959
Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a…
5.4
CVSS
7.7%
EPSS
No
On KEV
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:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)7.7% · higher than 95% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SH
SharePoint · Microsoft
before 16.0.19127.20442; 2016; 2019 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-20959
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-20959
Vendor Advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20959
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