CVE-2026-102866

CVE Enrichment

CVSS: 8.1 HIGH
CISA KEV: Not listed

Description

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

Technical Details

CVSS Version: 3.1
CNA / NVD Source: secure@microsoft.com
Published: 14-Oct-2026 02:17
Last Modified: 14-Oct-2026 05:17
CWE: CWE-347

CVSS Vector


            CVSS:3.1                            AV:N /
                            AC:H /
                            PR:N /
                            UI:N /
                            S:U /
                            C:H /
                            I:H /
                            A:H

References

secure@microsoft.com

Last enrichment sync: 14-Oct-2026 08:12
Sources: NVD · FIRST EPSS · CISA KEV
Latest successful provider update; providers refresh independently.

Reported Context (3)

CVE-2026-102866 Microsoft October 2026 Updates Fix 1,411 Flaws, Including Three Zero-Days
Dustin Childs, head of threat awareness for the Zero Day Initiative (ZDI) at TrendAI, warned security teams about CVE-2026-102866 (CVSS 8.1), a Microsoft Office SharePoint elevation of privilege vulnerability. Microsoft’s October 2026 Patch Tuesday Fixes 1,413 CVEs, Including Two Zero-Days
CVE-2026-102866 is a Critical elevation of privilege vulnerability in Microsoft SharePoint and has a CVSS score of 8.1. Microsoft’s October 2026 Patch Tuesday Fixes 1,413 Vulnerabilities, Including an Exploited Zero-Day

CVE (1237)

People (7)

MITRE ATT&CK (1)

Vendors (14)

Products (106)

Tools (1)

Note: Related entities, including threat actors, malware, CVEs, MITRE ATT&CK techniques, vendors, products, tools, countries, and industries, are shown when they appear in the same reporting. Their presence does not necessarily mean they were targeted, compromised, vulnerable, responsible for the activity, or directly involved in the incident.