Threat Intelligence Brief
Curated summary with source attribution
Source: thehackernews.com
Threat Risk: High
Victim: Organizations utilizing on-premises Microsoft SharePoint Servers
Incident: Active exploitation of a critical remote code execution vulnerability in Microsoft SharePoint Server.
Impact: Unauthorized attackers can execute arbitrary code and deploy malware on impacted servers.
Attacker: Unidentified threat actors
Analysis: The vulnerability CVE-2026-58644 leverages improper deserialization of untrusted data to enable remote code execution. Because it was weaponized as a zero-day, many on-premises environments may already be compromised. Attackers are reportedly combining this flaw with others to steal machine keys and maintain long-term persistence.
Recommendations: Apply Microsoft’s July 14, 2026, security updates immediately.; Ensure AMSI integration is active for all SharePoint web applications.; Restrict SharePoint Server exposure to the public internet.
Source: The Hacker News
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