Topic
SharePoint
Microsoft Copilot Can Surface Overshared Data Despite Permission Boundaries
AI Security
Building a Cybersecurity News Aggregator: Story Clustering, Seven Importance Signals and Strict Filtering Thresholds
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SOC Incident Analysis Exposes Active Exploitation of CVE-2025-53770 SharePoint ToolShell Auth Bypass and RCE
Vulnerabilities & ExploitsCISA Adds Three Exploited Vulnerabilities in FortiSandbox and SharePoint to KEV Catalog
The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has added three actively exploited vulnerabilities to its Known Exploited Vulnerabilities (KEV) catalog on July 16, 2026. Two of the flaws affect Fortinet’s FortiSandbox malware analysis product and involve OS command injection issues that can be triggered via specially crafted HTTP requests without requiring authentication. The third vulnerability impacts Microsoft SharePoint and stems from unsafe deserialization of untrusted data, potentially allowing remote code execution over the network. CISA’s action follows public advisories released by the vendors in April and June 2026. The agency is urging organizations to apply available patches and mitigations immediately to reduce the risk of compromise.
CISA Urges Immediate Patching as Multiple SharePoint Server Vulnerabilities Confirmed Exploited
The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has issued an urgent advisory after confirming active exploitation of multiple vulnerabilities in Microsoft SharePoint Server. Four specific CVEs have been added to the Known Exploited Vulnerabilities (KEV) catalog, with one additional flaw flagged by Microsoft as high-risk even without confirmed exploitation. Successful attacks can lead to remote code execution, theft of Internet Information Services (IIS) machine keys, establishment of persistent access, and deployment of malware. CISA recommends applying the latest Microsoft patches immediately, verifying successful installation, enabling the Antimalware Scan Interface (AMSI), and strengthening monitoring through Microsoft Defender Antivirus. Organizations are also advised to avoid direct internet exposure of SharePoint servers and to implement Layer 7 reverse proxies with enhanced logging to reduce the attack surface.