Dutch cybersecurity agency NCSC-NL just issued a serious alert: a patched macOS “Screen Sharing” vulnerability is being actively exploited in the wild, with real-world cases of cryptocurrency miners already deployed. The issue is tracked as CVE-2026-65400. Even after Apple’s emergency security update on Aug 6, NCSC-NL reports the threat is still spreading. After analyzing incoming reports, NCSC-NL found multiple Mac hosts directly reachable from the internet. Attackers use port 5900 as the entry point and show clear signs of successful exploitation—not just scanning. The end result: attackers obtain root (highest) privileges. Once they control the machine, they deploy mining tooling and turn the victim into a compute source. NCSC-NL notes the miner behavior is linked to Monero (XMR), a common choice for cybercriminals due to its privacy-focused ecosystem. If your Mac has Screen Sharing-related features enabled, update immediately and reduce internet exposure (especially remote/admin ports). Alerts are useless unless you close the attack surface. #macOS #Cybersecurity #Vulnerability #ThreatIntel #Monero #NCSC
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