Microsoft Releases Patches for RoguePlanet Defender Zero

Cybersecuritynews •Abinaya • July 9, 2026

Microsoft has released security updates to address a newly disclosed zero-day vulnerability in Microsoft Defender, publicly referred to as “RoguePlanet.” The flaw, tracked as CVE-2026-50656, affects the Microsoft Malware Protection Engine and could allow attackers to gain elevated privileges on vulnerable systems. The vulnerability is classified as an elevation-of-privilege issue. It carries a CVSS score […]

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This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

Nightmare-Eclipse Banned from GitHub and GitLab for Zero-Day Exploits The anonymous security researcher known as Nightmare-Eclipse has been banned from both GitHub and GitLab due to the release of multiple unpatched Windows vulnerabilities. GitHub terminated the account on May 25, 2026, after the researcher disclosed six exploits, including critical privilege escalation vulnerabilities like BlueHammer and YellowKey. Microsoft accused the researcher of violating coordinated vulnerability disclosure practices, leading to a public feud. Following the GitHub ban, Nightmare-Eclipse moved to GitLab, where they continued to release exploits until being suspended on May 26, 2026. The researcher has threatened further disclosures, claiming Microsoft has left them with no choice. The situation has sparked significant backlash within the cybersecurity community, highlighting tensions between researchers and corporate entities over vulnerability disclosure practices. 124 sources 68

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Microsoft Releases Patches for RoguePlanet Defender Zero

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