{"id":"CVE-2025-53770","title":"Deserialization of untrusted data in on-premises Microsoft SharePoint Server allows an unauthorized attacker to execute code over a network.\nMicrosoft is aware that an exploit for CVE-2025-53770 exists in the wild.\nMicrosoft is preparing…","summary":"Deserialization of untrusted data in on-premises Microsoft SharePoint Server allows an unauthorized attacker to execute code over a network.\nMicrosoft is aware that an exploit for CVE-2025-53770 exists in the wild.\nMicrosoft is preparing…","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-502"],"vendor":"microsoft","product":"sharepoint_server","affected":["sharepoint_server < 16.0.18526.20508","sharepoint_server = 2016","sharepoint_server = 2019"],"patched":["sharepoint_server 16.0.18526.20508"],"published":"2025-07-20","updated":"2026-08-04","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-53770","references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53770","label":"secure@microsoft.com"},{"url":"https://arstechnica.com/security/2025/07/sharepoint-vulnerability-with-9-8-severity-rating-is-under-exploit-across-the-globe/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/kaizensecurity/CVE-2025-53770","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://msrc.microsoft.com/blog/2025/07/customer-guidance-for-sharepoint-vulnerability-cve-2025-53770/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://news.ycombinator.com/item?id=44629710","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://research.eye.security/sharepoint-under-siege/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://therecord.media/microsoft-sharepoint-zero-day-vulnerability-exploited-globally","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.bleepingcomputer.com/news/microsoft/microsoft-sharepoint-zero-day-exploited-in-rce-attacks-no-patch-available/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.cisa.gov/news-events/alerts/2025/07/20/microsoft-releases-guidance-exploitation-sharepoint-vulnerability-cve-2025-53770","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.darkreading.com/remote-workforce/microsoft-rushes-emergency-fix-exploited-sharepoint-toolshell-flaw","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.forbes.com/sites/daveywinder/2025/07/20/microsoft-confirms-ongoing-mass-sharepoint-attack---no-patch-available/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://x.com/Shadowserver/status/1946900837306868163","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-53770","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","kev","in-the-wild","exploit-available"],"epss":0.99998,"epssPercentile":0.99991,"kev":true,"kevDateAdded":"2025-07-20","kevDueDate":"2025-07-21","kevRansomware":true,"exploited":true,"exploitAvailable":true,"zeroDay":true,"ingestedAt":"2026-08-04T05:36:13.285Z","exploits":{"exploitdb":true,"github":44,"githubRepos":["https://github.com/RukshanaAlikhan/CVE-2025-53770","https://github.com/Bluefire-Redteam-Cybersecurity/bluefire-sharepoint-cve-2025-53770","https://github.com/kaizensecurity/CVE-2025-53770"],"metasploit":["exploit/windows/http/sharepoint_toolpane_rce"],"nuclei":["CVE-2025-53770"],"checkedAt":"2026-09-10T03:03:49.947Z"},"slug":"CVE-2025-53770","body":"## Overview\n\nDeserialization of untrusted data in on-premises Microsoft SharePoint Server allows an unauthorized attacker to execute code over a network.\nMicrosoft is aware that an exploit for CVE-2025-53770 exists in the wild.\nMicrosoft 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.\n\n## Affected\n\n- `sharepoint_server < 16.0.18526.20508`\n- `sharepoint_server = 2016`\n- `sharepoint_server = 2019`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `sharepoint_server 16.0.18526.20508`","depth":"hadal","depthScore":100,"depthScoreParts":{"impact":53.9,"likelihood":20,"exploitation":25,"ransomware":5},"changes":[]}