CVE-2025-53770
Microsoft SharePoint Server Remote Code Execution Vulnerability
- Published
- Jul 20, 2025
- Updated
- Aug 4, 2026
- Assigning CNA
- microsoft
- Evidence observed
- Jul 20, 2025
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HHigh · next 30 days
- Percentile
- 100.0%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
CISA Known Exploited
This CVE appears in the CISA Known Exploited Vulnerabilities catalog.
Summary
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.
Sources
34- CVE-2025-53770-ScannerScanner
🎯 Vulnerability scanner for SharePoint servers affected by CVE-2025-53770. Detects unsafe deserialization using ToolPane.aspx with a crafted base64+gzip payload. 🛡️ Developed by Ahmed Tamer.
Proof-of-concept exploit for unauthenticated remote code execution via unsafe deserialization in Microsoft SharePoint Server (CVE-2025-53770), with payload extraction and decoding commands.
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