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Nightmare Eclipse reportedly releases new Microsoft Defender exploit after identity reveal

SecurityWeek identifies the exploit leaker as Abdelhamid Naceri, a former Microsoft Germany employee also known as Chaotic Eclipse.

SecurityWeekSE
The RegisterTR
2 Sources, 19d ago, first seen 19d ago

TLDR

SecurityWeek reports that Nightmare Eclipse released a new Microsoft Defender exploit after revealing their identity. The outlet identifies the leaker, also known as Chaotic Eclipse, as Abdelhamid Naceri, a former Microsoft Germany employee.

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2 Sources, first seen 19d ago

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Combined views

4.7K

2 Sources, first seen 19d ago

7 likes1 comments1 saves2 reposts

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2 Sources

SecurityWeek@SecurityWeekNightmare Eclipse Drops New Microsoft Defender Exploit After Revealing Identity https://www.securityweek.com/nightmare-eclipse-drops-new-microsoft-defender-exploit-after-revealing-identity/19d
The Register@TheRegisterNightmareEclipse's latest zero-day leaves Microsoft Defender stuck in the past https://www.theregister.com/security/2026/09/22/nightmareeclipses-latest-zero-day-leaves-microsoft-defender-stuck-in-the-past/5298320?utm_source=dlvr.it&utm_medium=twitter19d
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    2 Sources

    SecurityWeek@SecurityWeekNightmare Eclipse Drops New Microsoft Defender Exploit After Revealing Identity https://www.securityweek.com/nightmare-eclipse-drops-new-microsoft-defender-exploit-after-revealing-identity/19d
    The Register@TheRegisterNightmareEclipse's latest zero-day leaves Microsoft Defender stuck in the past https://www.theregister.com/security/2026/09/22/nightmareeclipses-latest-zero-day-leaves-microsoft-defender-stuck-in-the-past/5298320?utm_source=dlvr.it&utm_medium=twitter19d
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