CVE-2026-102866

HIGH

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

CVSS v3.1 Score

8.1
HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
NETWORK
Complexity
HIGH
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Published: 10/13/2026Modified: 10/14/2026

Related Intelligence (1)

CRITICALZero Day

October Patch Tuesday roundup: Over 1,400 Microsoft holes to be plugged, including three zero days

Microsoft released a record-shattering 1,407 CVEs to be plugged today on October Patch Tuesday, breaking the 2020 record of 1,261. The list was so long that its release was several hours later than the usual 1 p.m. Eastern drop time, somewhat frustrating admins. The bugs include three zero-day vulnerabilities, one of which has been exploited. The zero day being exploited, and that should be dealt

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CSO Online

References (1)

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