Critical severity9.8CISA KEVNVD Advisory· Published Jul 20, 2025· Updated Aug 4, 2026
CVE-2025-53770
CVE-2025-53770
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
7cpe:2.3:a:microsoft:sharepoint_server:*:*:*:*:subscription:*:*:*+ 5 more
- cpe:2.3:a:microsoft:sharepoint_server:*:*:*:*:subscription:*:*:*range: <16.0.18526.20508
- cpe:2.3:a:microsoft:sharepoint_server:2016:*:*:*:enterprise:*:*:*
- cpe:2.3:a:microsoft:sharepoint_server:2019:*:*:*:*:*:*:*
- (no CPE)
- (no CPE)range: 16.0.0
- (no CPE)range: 16.0.0
- Range: 16.0.0
Patches
Vulnerability mechanics
References
12- arstechnica.com/security/2025/07/sharepoint-vulnerability-with-9-8-severity-rating-is-under-exploit-across-the-globe/nvdExploitPress/Media Coverage
- research.eye.security/sharepoint-under-siege/nvdExploitMitigationThird Party Advisory
- msrc.microsoft.com/blog/2025/07/customer-guidance-for-sharepoint-vulnerability-cve-2025-53770/nvdMitigationVendor Advisory
- msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53770nvdVendor Advisory
- www.cisa.gov/news-events/alerts/2025/07/20/microsoft-releases-guidance-exploitation-sharepoint-vulnerability-cve-2025-53770nvdMailing ListThird Party AdvisoryUS Government Resource
- x.com/Shadowserver/status/1946900837306868163nvdThird Party Advisory
- news.ycombinator.com/itemnvdIssue Tracking
- therecord.media/microsoft-sharepoint-zero-day-vulnerability-exploited-globallynvdPress/Media Coverage
- www.bleepingcomputer.com/news/microsoft/microsoft-sharepoint-zero-day-exploited-in-rce-attacks-no-patch-available/nvdPress/Media Coverage
- www.cisa.gov/known-exploited-vulnerabilities-catalognvdUS Government Resource
- www.darkreading.com/remote-workforce/microsoft-rushes-emergency-fix-exploited-sharepoint-toolshell-flawnvdPress/Media Coverage
- www.forbes.com/sites/daveywinder/2025/07/20/microsoft-confirms-ongoing-mass-sharepoint-attack---no-patch-available/nvdPress/Media Coverage
News mentions
4- PoC and Technical Details Released for SharePoint Remote Code Execution VulnerabilityCyber Security News · Jul 8, 2026
- Exploits and vulnerabilities in Q1 2026Securelist · May 7, 2026
- Ransomware Tactics, Techniques, and Procedures in a Shifting Threat LandscapeMandiant Threat Intelligence · Mar 16, 2026
- Top 10 web hacking techniques of 2025: call for nominationsPortSwigger Research · Jan 6, 2026