BaseFortify

Publication date: 2025-07-20

Last updated on: 2026-08-04

Assigner: Microsoft Corporation

Description

Deserialization of untrusted data in on-premises Microsoft SharePoint Server allows an unauthorized attacker to execute code over a network. Microsoft is aware that an exploit for CVE-2025-53770 exists in the wild. Microsoft is preparing and fully testing a comprehensive update to address this vulnerability. In the meantime, please make sure that the mitigation provided in this CVE documentation is in place so that you are protected from exploitation.

CVSS Scores

EPSS Scores

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Meta Information

Published

2025-07-20

Last Modified

2026-08-04

Generated

2026-10-16

AI Q&A

2025-07-20

EPSS Evaluated

2026-10-14

NVD

CVE-2025-53770

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	sharepoint_server	to 16.0.18526.20508 (exc)
microsoft	sharepoint_server	2016
microsoft	sharepoint_server	2019

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 deserialization of untrusted data in on-premises Microsoft SharePoint Server, which allows an unauthorized attacker to execute code remotely over a network.

Impact Analysis

An attacker exploiting this vulnerability can execute arbitrary code on the affected SharePoint Server remotely, potentially leading to full compromise of the system, including data theft, data loss, or disruption of services.

Mitigation Strategies

Microsoft is preparing a comprehensive update to address this vulnerability. In the meantime, ensure that the mitigation provided in the CVE documentation is in place to protect from exploitation. Specific immediate mitigation steps are not detailed in the provided information.

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