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Sharepoint Online CVE-2025-59245

CRITICAL
Deserialization of Untrusted Data (CWE-502)
2025-11-20 secure@microsoft.com
Deserialization Microsoft Sharepoint Online
9.8
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

2
Analysis Generated
Mar 28, 2026 - 19:23 vuln.today
CVE Published
Nov 20, 2025 - 23:15 nvd
CRITICAL 9.8

DescriptionCVE.org

Microsoft SharePoint Online Elevation of Privilege Vulnerability

AnalysisAI

Microsoft SharePoint Online Elevation of Privilege Vulnerability. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Technical ContextAI

This vulnerability is classified as Deserialization of Untrusted Data (CWE-502), which allows attackers to execute arbitrary code through malicious serialized objects. Microsoft SharePoint Online Elevation of Privilege Vulnerability Affected products include: Microsoft Sharepoint Online.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Avoid deserializing untrusted data. Use safe serialization formats (JSON). Implement integrity checks and type allowlists.

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CVE-2025-59245 vulnerability details – vuln.today
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