CVE-2025-53770 CRITICAL

CVE-2025-53770: Microsoft SharePoint Server Remote Code Execution Vulnerability

Vendor Microsoft
Product Microsoft SharePoint Enterprise Server 2016
Weakness CWE-502 · Unsafe deserialization
KEV Status Known Exploited
Ransomware Used in campaigns
Published July 20, 2025
Last update February 26, 2026
View on NVD All CVEs

CVSS base score

9.8/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:W/RC:C

What the vulnerability does

01Description

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.

CISA mandated remediation

02CISA 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.

Key dates

03Disclosure timeline

July 20, 2025 CVE published
February 26, 2026 Record updated

External resources

04References

NVD — National Vulnerability Database https://nvd.nist.gov/vuln/detail/CVE-2025-53770 CWE — Common Weakness Enumeration https://cwe.mitre.org/data/definitions/502.html CISA KEV Reference https://www.cisa.gov/news-events/alerts/2025/07/20/microsoft-r… CISA KEV Reference https://www.microsoft.com/en-us/security/blog/2025/07/22/disru… CISA KEV Reference https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025… CISA KEV Reference https://nvd.nist.gov/vuln/detail/CVE-2025-53770