CVE-2025-53770: Microsoft SharePoint Deserialization of Untrusted Data Vulnerability
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.
Other sources
Microsoft SharePoint Server on-premises contains a deserialization of untrusted data vulnerability that could allow an unauthorized attacker to execute code over a network. This vulnerability could be chained with CVE-2025-53771. CVE-2025-53770 is a patch bypass for CVE-2025-49704, and the updates for CVE-2025-53770 include more robust protection than those for CVE-2025-49704.
— CISA
Microsoft SharePoint Server Remote Code Execution Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.10417.20037Patch KB5002753 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.18526.20508Patch KB5002768 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.5513.1001Patch KB5002759 - Compensating control
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.
- Compensating control
In the meantime, ensure the mitigation provided in this CVE documentation is in place so you are protected from exploitation.
Event History
Frequently Asked Questions
What is the severity of CVE-2025-53770?
CVE-2025-53770 is considered critical due to the potential for attackers to execute arbitrary code remotely.
How do I fix CVE-2025-53770?
To fix CVE-2025-53770, apply the latest security updates provided by Microsoft for SharePoint products.
Which versions of SharePoint Server are affected by CVE-2025-53770?
CVE-2025-53770 affects Microsoft SharePoint Server 2019, SharePoint Enterprise Server 2016, and SharePoint Server Subscription Edition.
Is there an exploit for CVE-2025-53770 active in the wild?
Yes, there is evidence that an exploit for CVE-2025-53770 is currently active in the wild.
What are the consequences of not addressing CVE-2025-53770?
Failure to address CVE-2025-53770 may lead to unauthorized code execution, resulting in data breaches or system compromise.