CVE-2025-53770

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.

The following products are affected by CVE-2025-53770 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2025-53770.

URL	Resource
https://arstechnica.com/security/2025/07/sharepoint-vulnerability-with-9-8-severity-rating-is-under-exploit-across-the-globe/
https://github.com/kaizensecurity/CVE-2025-53770
https://msrc.microsoft.com/blog/2025/07/customer-guidance-for-sharepoint-vulnerability-cve-2025-53770/
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53770
https://news.ycombinator.com/item?id=44629710
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/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-53770
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