This Microsoft Defender zero-day could give hackers unprecedented access to your system

Date:
Wed, 10 Jun 2026 19:15:00 +0000

Description:
Chaotic Eclipse strikes again, releasing their seventh zero-day in just two months.

FULL STORY ======================================================================Copy link Facebook X Whatsapp Reddit Pinterest Flipboard Threads Email Share this article 0 Join the conversation Follow us Add us as a preferred source on Google Newsletter Subscribe to our newsletter Chaotic Eclipse drops seventh Windows zeroday, RoguePlanet, hours after Patch Tuesday Racecondition exploit grants SYSTEM privileges; PoC confirmed viable by ThreatLocker Researcher continues public disclosures amid feud with Microsoft, following BlueHammer, RedSun, UnDefend, YellowKey, GreenPlasma, and MiniPlasma Chaotic Eclipse, the mysterious security researcher with a Microsoft grudge, disclosed another zero-day vulnerability in a fully patched Windows 11 device, just hours after Microsoft released its recent record June Patch Tuesday cumulative update.

This is the seventh zero-day exploit Chaotic Eclipse has disclosed in a
matter of months. Called RoguePlanet, this bug is described as a race condition vulnerability that grants attackers SYSTEM privileges on fully patched Windows 10 and Windows 11 devices. The researcher published a Proof-of-Concept (PoC) exploit earlier this week in a self-hosted Git, after saying that both GitHub and GitLab repositories hosting earlier work got removed by Microsoft. Latest Videos From Watch full video here: Performing as described "The exploit is a race condition, so it's a hit or miss. I have managed to get a 100% success rate on some machines while it struggled to
work on others," they explained.

Security researchers ThreatLocker confirmed to the publication that the flaw works, and even recorded a video to demonstrate how it works. You may like Disgruntled researcher releases second major Defender zero-day Chaotic
Eclipse strikes again with another worrying Windows security flaw This worrying Microsoft BitLocker backdoor can grant full access to a locked drive
and all you need is a USB stick

"Our initial analysis confirms that the RoguePlanet exploit is viable and performs as described. Organizations using application allowlisting can prevent the exploit from executing, providing an effective layer of
protection against this attack," Danny Jenkins, CEO of ThreatLocker, told BleepingComputer .

In early April 2026, Chaotic Eclipse disclosed finding BlueHammer , a Windows Defender privilege escalation vulnerability. At the time, they said they were leaking it because they were unsatisfied with how Microsoft handled vulnerability disclosures. Are you a pro? Subscribe to our newsletter Sign up to the TechRadar Pro newsletter to get all the top news, opinion, features
and guidance your business needs to succeed! Contact me with news and offers from other Future brands Receive email from us on behalf of our trusted partners or sponsors By submitting your information you agree to the Terms & Conditions and Privacy Policy and are aged 16 or over.

"They mopped the floor with me and pulled every childish game they could. It was soo bad at some point I was wondering if I was dealing with a massive corporation or someone who is just having fun seeing me suffer but it seems
to be a collective decision, they later elaborated.

In the meantime, six more flaws were disclosed: RedSun, UnDefend, YellowKey, GreenPlasma, and MiniPlasma - with Microsoft releasing this months Patch Tuesday cumulative update, fixing two of the flaws: GreenPlasma and
YellowKey. The best antivirus for all budgets Our top picks, based on real-world testing and comparisons

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