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Angry bug hunter with Microsoft beef drops new Windows 0-day

ID: d7621f07-fdbb-5eb4-9dad-5f63bf36e652

STIX ID: report--d7621f07-fdbb-5eb4-9dad-5f63bf36e652

Feed Name: The Register (Security)

Threat Score
75/100

Date Published: 2026-06-10

Date Updated: 2026-06-11

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RoguePlanet is a newly disclosed zero-day in Microsoft Defender impacting fully patched Windows 10 and 11 that can allow local privilege escalation to SYSTEM when a race condition is exploited; the researcher 'Nightmare Eclipse' released proof-of-concept code, third-party analysts validated the exploit, and Microsoft is investigating amid a history of the researcher publicly disclosing multiple prior Microsoft zero-days.

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