Microsoft Confirms Defender RoguePlanet 0

Cybersecuritynews •Guru Baran • June 18, 2026

Microsoft has officially acknowledged a critical zero-day vulnerability in Microsoft Defender, publicly dubbed “RoguePlanet,” and confirmed it is actively developing a security patch to address the flaw. Tracked as CVE-2026-50656, the vulnerability was formally published on June 16, 2026, by the Microsoft Security Response Center (MSRC) and carries a CVSS score of 7.8 (Important) under […]

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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.

Microsoft Acknowledges RoguePlanet Zero-Day Vulnerability in Defender Microsoft has confirmed a critical zero-day vulnerability in Microsoft Defender, identified as CVE-2026-50656, which allows for local privilege escalation. The flaw, dubbed 'RoguePlanet,' was disclosed by security researcher Nightmare Eclipse and has a CVSS score of 7.8. It exploits a race condition in Defender, enabling attackers to gain system privileges without user interaction. Microsoft is actively working on a security patch to address this vulnerability. The vulnerability affects Windows 10 and Windows 11 systems with the June 2026 patches installed. A proof-of-concept exploit has been released, demonstrating the ease of exploitation. Microsoft has advised users to remain vigilant until a patch is available. 9 sources 72

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Microsoft Confirms Defender RoguePlanet 0

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