CVE Watch4 ago 2026

CVE-2025-53770

Microsoft SharePoint Deserialization of Untrusted Data Vulnerability

CVSS

9.8

Crítico

EPSS

100.0%

p100

KEV

SÍ

20 jul 2025

Exploit Today

0-100

Publicado: 20 jul 2025 · Última mod.: 4 ago 2026 · CWE-502

EPSS · 30d

100.0%EPSS · 30 días100.0%

2026-08-022026-08-30

Ficha del catálogo KEV

Producto

Microsoft / SharePoint

Vulnerabilidad

Microsoft SharePoint Deserialization of Untrusted Data Vulnerability

Añadido a KEV

20 jul 2025

Remediar antes de

21 jul 2025

Uso conocido en ransomware

Sí

Descripción resumida

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.

Acción requerida

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.

Notas

CISA Mitigation Instructions: https://www.cisa.gov/news-events/alerts/2025/07/20/microsoft-releases-guidance-exploitation-sharepoint-vulnerability-cve-2025-53770; https://www.microsoft.com/en-us/security/blog/2025/07/22/disrupting-active-exploitation-of-on-premises-sharepoint-vulnerabilities/ ; https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53770 ; https://nvd.nist.gov/vuln/detail/CVE-2025-53770

Descripción técnica

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.

Referencias oficiales

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