Critical [CVE-2025-53770] Microsoft SharePoint Server Remote Code Execution Vulnerability
This critical-severity Microsoft Server advisory covers CVE-2025-53770 affecting Microsoft SharePoint Enterprise Server 2016, Microsoft SharePoint Server 2019, Microsoft SharePoint Server Subscription Edition.
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Summary
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 named by the advisory: Microsoft SharePoint Enterprise Server 2016; Microsoft SharePoint Server 2019; Microsoft SharePoint Server Subscription Edition.
CISA Known Exploited Vulnerability
- Listed:
- Jul 20, 2025 · federal remediation due Jul 21, 2025
- 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 use:
- Known
KEV is a prioritization signal from CISA — remediation detail still comes from the vendor advisory.
- Microsoft SharePoint Enterprise Server 2016 16.0.0 before 16.0.5513.1001
- Microsoft SharePoint Server 2019 16.0.0 before 16.0.10417.20037
- Microsoft SharePoint Server Subscription Edition 16.0.0 before 16.0.18526.20508
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
- 16.0.5513.1001
- 16.0.10417.20037
- 16.0.18526.20508
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Mitigation checklist
- Microsoft is preparing and fully testing a comprehensive update to address this vulnerability.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
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