CVE-2026-66808
Received Received - Intake

Deserialization Flaw in Microsoft Office SharePoint Permits Remote Code Execution

Publication date: 2026-08-11

Last updated on: 2026-08-11

Assigner: Microsoft Corporation

Description
Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published
2026-08-11
Last Modified
2026-08-11
Generated
2026-08-11
AI Q&A
2026-08-11
EPSS Evaluated
N/A
NVD
CVE-2026-66808
EUVD
EUVD-2026-56750

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
microsoft office_sharepoint *

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-502 The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
Executive Summary

This vulnerability involves deserialization of untrusted data in Microsoft Office SharePoint. An authorized attacker can exploit this to execute arbitrary code remotely over a network.

Impact Analysis

An attacker could gain control of affected systems, steal data, install malware, or disrupt operations. Systems with SharePoint exposed to the network are at risk.

Compliance Impact

This vulnerability could lead to unauthorized data access or exfiltration, violating GDPR and HIPAA requirements for data protection and confidentiality.

Mitigation Strategies

Apply the latest security updates from Microsoft for SharePoint as soon as possible to patch the deserialization flaw. Monitor Microsoft's official security advisories for specific mitigation guidance and disable unnecessary services if updates cannot be applied immediately.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-66808. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart