CVE-2025-53770

Vulnerability 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.

CVSS Score

Affected Products

Related Weaknesses (CWE)

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53770Vendor Advisory
• https://arstechnica.com/security/2025/07/sharepoint-vulnerability-with-9-8-severExploitPress/Media Coverage
• https://github.com/kaizensecurity/CVE-2025-53770Exploit
• https://msrc.microsoft.com/blog/2025/07/customer-guidance-for-sharepoint-vulneraMitigationVendor Advisory
• https://news.ycombinator.com/item?id=44629710Issue Tracking
• https://research.eye.security/sharepoint-under-siege/ExploitMitigationThird Party Advisory
• https://therecord.media/microsoft-sharepoint-zero-day-vulnerability-exploited-glPress/Media Coverage
• https://www.bleepingcomputer.com/news/microsoft/microsoft-sharepoint-zero-day-exPress/Media Coverage
• https://www.cisa.gov/news-events/alerts/2025/07/20/microsoft-releases-guidance-eMailing ListThird Party AdvisoryUS Government Resource
• https://www.darkreading.com/remote-workforce/microsoft-rushes-emergency-fix-explPress/Media Coverage
• https://www.forbes.com/sites/daveywinder/2025/07/20/microsoft-confirms-ongoing-mPress/Media Coverage
• https://x.com/Shadowserver/status/1946900837306868163Third Party Advisory
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-US Government Resource