Deserialization Flaw in Microsoft Office SharePoint Elevates Privileges

Publication date: 2026-06-09

Last updated on: 2026-06-12

Assigner: Microsoft Corporation

Description

Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to elevate privileges over a network.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-06-09

Last Modified

2026-06-12

Generated

2026-06-30

AI Q&A

2026-06-09

EPSS Evaluated

2026-06-28

NVD

CVE-2026-45484

EUVD

EUVD-2026-35581

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	sharepoint_server	2019
microsoft	sharepoint_server	2016
microsoft	sharepoint_server	to 16.0.19725.20384 (exc)

Helpful Resources

Exploitability

CWE

KEV

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

Attack-Flow Graph

Executive Summary

This vulnerability involves the deserialization of untrusted data in Microsoft Office SharePoint. It allows an authorized attacker to elevate their privileges over a network by exploiting how SharePoint processes serialized data.

Impact Analysis

The impact of this vulnerability is an elevation of privilege, meaning an attacker who already has some level of access can gain higher-level permissions. This can lead to full control over the affected system, potentially compromising confidentiality, integrity, and availability of data.

Hi! I’m here to help you understand CVE-2026-45484. Ask me anything about the vulnerability, its impact, or mitigation strategies.

0/70