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.

• CWE-502

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

Published

Jul 20, 2025

Last Modified

Aug 4, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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