Introduction
Privilege escalation in cloud collaboration platforms can lead to unauthorized access to sensitive business data and administrative controls. CVE-2025-59245 is a critical vulnerability in Microsoft SharePoint Online, a core component of Microsoft 365 used by organizations worldwide for document management and collaboration. This brief summary outlines what is currently known about the vulnerability, its technical classification, and the broader context of SharePoint security issues as of November 2025.
Technical Information
CVE-2025-59245 is classified as an elevation of privilege vulnerability affecting Microsoft SharePoint Online. The vulnerability is assigned a CVSS score of 9.8, indicating critical severity. The root cause is categorized under CWE-502: Deserialization of Untrusted Data. This class of vulnerability arises when an application deserializes data from an untrusted source without proper validation, potentially allowing attackers to manipulate object state or execute arbitrary code.
No specific technical details, code snippets, or exploitation vectors for CVE-2025-59245 have been published in public sources as of November 2025. There are no public indicators of compromise or detection methods available.
Affected Systems and Versions
- Product: Microsoft SharePoint Online
- No specific version numbers or configuration details have been published for CVE-2025-59245 as of November 2025.
Vendor Security History
Microsoft has a long history as the leading provider of enterprise productivity platforms. SharePoint Online is a critical part of Microsoft 365, used by millions of organizations globally. Recent years have seen several critical vulnerabilities in SharePoint, including deserialization and privilege escalation issues (see CVE-2025-53770). Microsoft typically responds quickly with patches and advisories, but the recurrence of similar flaws highlights the ongoing challenge of securing complex, integrated cloud platforms.
