Microsoft vs Chaotic Eclipse: three zero-days now actively exploited

📰 Reddit r/cybersecurity

Microsoft is facing three actively exploited zero-days after a researcher named Chaotic Eclipse publicly released them, citing ignored reports and poor communication from Microsoft

advanced Published 28 May 2026
Action Steps
  1. Investigate the six publicly released Windows zero-days by Chaotic Eclipse
  2. Assess the potential impact of the vulnerabilities on your organization's systems
  3. Apply patches and updates to affected systems as soon as possible
  4. Monitor for signs of exploitation and be prepared to respond quickly
  5. Review and improve your organization's vulnerability reporting and communication processes
Who Needs to Know This

Security teams and developers at Microsoft and other organizations should be aware of these vulnerabilities and take immediate action to patch and protect their systems, as these zero-days are being actively exploited

Key Insight

💡 Ignoring vulnerability reports and poor communication can lead to public disclosure and active exploitation, highlighting the importance of responsible disclosure and prompt action

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🚨 Three Windows zero-days actively exploited after researcher Chaotic Eclipse goes public 🚨

Key Takeaways

Microsoft is facing three actively exploited zero-days after a researcher named Chaotic Eclipse publicly released them, citing ignored reports and poor communication from Microsoft

Full Article

This one has been building for a month and it came to a head this week. A researcher going by Chaotic Eclipse has released six Windows zero-days publicly over the past several weeks, covering Defender, BitLocker, and Windows CTFMON. The researcher's stated reason was that Microsoft ignored their reports, closed tickets without explanation, and at one point deleted the Microsoft account they used to submit vulnerabilities. Three of those six vulne
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