CVE-2026-102866

Improper verification of cryptographic signature in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network.

Score

CVSS 3.1 8.1 High

Status

Analyzed - secure@microsoft.com

Published

2026-10-13

Last modified

2026-10-28

Weaknesses

CWE-347

Affected products

• Sharepoint Server (Microsoft)

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-102866