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CVE-2025-53770

Act now ● On CISA KEV — actively exploited used in ransomware

Actively exploited — on the CISA KEV list.

Description

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

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53770
• exploit https://arstechnica.com/security/2025/07/sharepoint-vulnerability-with-9-8-severity-rating-is-under-exploit-across-the-globe/
• exploit https://github.com/kaizensecurity/CVE-2025-53770
• https://msrc.microsoft.com/blog/2025/07/customer-guidance-for-sharepoint-vulnerability-cve-2025-53770/
• https://news.ycombinator.com/item?id=44629710
• exploit https://research.eye.security/sharepoint-under-siege/
• https://therecord.media/microsoft-sharepoint-zero-day-vulnerability-exploited-globally
• https://www.bleepingcomputer.com/news/microsoft/microsoft-sharepoint-zero-day-exploited-in-rce-attacks-no-patch-available/
• https://www.cisa.gov/news-events/alerts/2025/07/20/microsoft-releases-guidance-exploitation-sharepoint-vulnerability-cve-2025-53770
• https://www.darkreading.com/remote-workforce/microsoft-rushes-emergency-fix-exploited-sharepoint-toolshell-flaw
• https://www.forbes.com/sites/daveywinder/2025/07/20/microsoft-confirms-ongoing-mass-sharepoint-attack---no-patch-available/
• https://x.com/Shadowserver/status/1946900837306868163
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-53770

Official: NVD · CVE.org