Vulnerabilitycritical
SharePoint ‘ToolShell’ Vulnerabilities Exploited by Chinese Hackers
Vulnerabilities mentioned
All| CVE | Vulnerability | CVSS | EPSS | Signals | Published |
|---|---|---|---|---|---|
| CVE-2025-53770 | Unauthenticated Deserialization RCE in Microsoft SharePoint Server on-premises | 9.8 | 100% | KEVRansomwarePoC ×3 | KEV |
| CVE-2025-53771 | Improper Authentication in Microsoft SharePoint Server Enables Network Spoofing | 6.5 | 100% |
From the original article
3 min read at infosecurity-magazine.com
Microsoft has confirmed three Chinese-based threat groups have been actively exploiting CVE-2025-53770 and CVE-2025-53771 , two critical and high-severity vulnerabilities in internet-facing SharePoint servers . The chained exploitation of these two bugs has been dubbed ‘ToolShell’ by the cybersecurity community.
By Kevin Poireault · infosecurity-magazine.com
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