All vulnerabilities
CVE-2026-102859

Microsoft Office SharePoint Spoofing Vulnerability

Microsoft Microsoft SharePoint Server Subscription EditionApplications & CMS
Open in ThreatlineRecord JSON
CVSS
4.6Medium
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.36%Chance of exploitation activity in the next 30 days, higher than 28% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in16.0.20326.20190Fixed versionCVE List
Published13 Oct 2026Updated 23 Oct 2026CVE List

What fixes it

  • 16.0.20326.20190Microsoft SharePoint Server Subscription EditionCVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Vendor and government advisories 1

Vendors that say their products are affected, and agencies that issued alerts. Check each for the fixed release of the product you run.

Reports 1

1 outlet mention it. Reports are not confirmation; each links to its source.

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.

Text from CVE List

Affected versions 1

  • Microsoft SharePoint Server Subscription Editionaffected: 16.0.0 before 16.0.20326.20190CVE List

References 1