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.
Is CVE-2025-53770 exploited?
Listed in the CISA KEV catalog on 2025-07-20.
Federal remediation due 2025-07-21.
Past that date by 436 days.
Used in ransomware campaigns.
EPSS puts exploitation in the next 30 days at 100.0%.
Public exploit code: packaged in a public tool.
Public detection rules exist.
Which products and versions are affected?
Microsoft · Microsoft SharePoint Enterprise Server 2016 · >= 16.0.0, < 16.0.5513.1001
Microsoft · Microsoft SharePoint Server 2019 · >= 16.0.0, < 16.0.10417.20037
Microsoft · Microsoft SharePoint Server Subscription Edition · >= 16.0.0, < 16.0.18526.20508