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9.8 Critical

CVE-2025-53770 Microsoft SharePoint Deserialization of Untrusted Data Vulnerability

Active exploitation observed

· CISA KEV catalogue
Required action Disconnect public-facing versions of SharePoint Server that have reached their end-of-life (EOL) or end-of-service (EOS) to include SharePoint Server 2013 and earlier versions. For supported versions, please follow the mitigations according to CISA (URL listed below in Notes) and vendor instructions (URL listed below in Notes). Adhere to the applicable BOD 22-01 guidance for cloud services or discontinue use of the product if mitigations are not available.
Ransomware campaigns Known to be used
Weakness CWE-502

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.

Affected products and versions

Product Affected versions Fixed in
Microsoft SharePoint Enterprise Server 2016 16.0 16.0.0 → < 16.0.5513.1001 16.0.5513.1001
Microsoft SharePoint Server 2019 16.0 16.0.0 → < 16.0.10417.20037 16.0.10417.20037
Microsoft SharePoint Server Subscription Edition 16.0 16.0.0 → < 16.0.18526.20508 16.0.18526.20508

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