CVE-2026-45484

Microsoft SharePoint Elevation of Privilege Vulnerability

State: Published
Severity: 8.8 High
Published: Jun 9, 2026
Updated: Sep 24, 2026
Reserved: May 12, 2026

Description

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

Scores

CVSS	Score	Vector	Source
3.1	8.8 High	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C	microsoft

Weaknesses

CWE-502 Deserialization of Untrusted Data

Affected Products

Product	Versions
Microsoft SharePoint Enterprise Server 2016Microsoft	16.0.0 to before 16.0.5556.1005Affected
Microsoft SharePoint Server 2019Microsoft	16.0.0 to before 16.0.10417.20153Affected
Microsoft SharePoint Server Subscription EditionMicrosoft	16.0.0 to before 16.0.19725.20384Affected

References

Microsoft SharePoint Elevation of Privilege Vulnerabilityvendor-advisorypatch

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