eclipse

Tech Optimizer
September 3, 2026
Nightmare Eclipse, a security researcher known for identifying vulnerabilities in Microsoft products, has shifted focus to other vendors, revealing a zero-day vulnerability called FalconFlank that targets CrowdStrike’s Falcon endpoint security platform. FalconFlank is a privilege escalation vulnerability that exploits the Microsoft Office malicious macros remediation feature within CrowdStrike Falcon. CrowdStrike is investigating the claims and advises customers to disable the Microsoft Office File Suspicious Macro Removal Windows policy setting while assuring them of continued protection through Cloud Anti-malware settings. The exploit works on fully updated Windows 11 25H2 and Windows Server 2025 systems running CrowdStrike Falcon with Optimal Protection enabled. Nightmare Eclipse has also discovered other vulnerabilities, including HardBreacher affecting Kaspersky’s endpoint antivirus and PrettyPrague in Gen Digital’s Avast antivirus, which allows attackers to dump the SAM database. Gen Digital is developing a patch for the Avast vulnerability, while Kaspersky has not commented. Additionally, Nightmare disclosed a memory corruption zero-day vulnerability in Nvidia, named GreenSection, which causes system crashes.
AppWizard
September 2, 2026
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Winsage
August 18, 2026
A new exploit named ShieldBreak, developed by Nightmare-Eclipse, targets Microsoft Defender by allowing privilege escalation and bypassing previous security fixes related to the RoguePlanet vulnerability. ShieldBreak operates on Windows 11 25H2, its Canary channel, and Windows Server 2025, achieving a "100% success rate." Windows 10 may also be vulnerable, but the exploit is specifically designed for Windows 11. There is currently no patch for ShieldBreak, and users are advised to disable Microsoft Defender, implement two-factor authentication, and exercise caution with suspicious online activities. Malwarebytes has recommended its Premium Security antivirus as a temporary solution.
Winsage
August 13, 2026
Nightmare Eclipse has released a new zero-day exploit called ShieldBreak, which can bypass Microsoft's RoguePlanet patch (CVE-2026-50656) and allow attackers to gain SYSTEM privileges on fully patched Windows 10, Windows 11, and Windows Server systems. The exploit has been confirmed by security expert Kevin Beaumont, who provided detection methods for it. ShieldBreak is the tenth zero-day from Nightmare Eclipse since April and was released shortly after Microsoft's monthly Patch Tuesday. The exploit allows local privilege escalation and has a 100% success rate on the latest version of Windows 11 and Windows Server 2025, while Windows 10 remains vulnerable. Microsoft is aware of the vulnerability and is investigating it, emphasizing the importance of coordinated vulnerability disclosure. Previous exploits from Nightmare Eclipse include LegacyHive and GreatXML, with earlier vulnerabilities having been patched but recent ones still unaddressed. Microsoft had threatened legal action against Nightmare Eclipse in May but later reconsidered its approach to vulnerability disclosure.
Winsage
August 13, 2026
Security researcher Nightmare Eclipse has released a zero-day exploit named ShieldBreak that allows privilege escalation on Windows by targeting a vulnerability in Microsoft Defender. This exploit, designated as CVE-2026-50656, is categorized as a race condition vulnerability and affects the latest versions of Windows 11 and Windows Server 2025, with potential impacts on Windows 10. The exploit was disclosed on June 9, 2026, and Microsoft acknowledged the issue on June 16, rolling out fixes by July 9. The mechanics of ShieldBreak involve manipulating Defender’s scan path and executing a scheduled task to gain System-level privileges. Experts have noted differences between ShieldBreak and the previously known RoguePlanet exploit, emphasizing that ShieldBreak requires Defender to be active to function.
Winsage
August 13, 2026
A vulnerability in Microsoft Defender, named ShieldBreak, has been revealed by security researcher Nightmare Eclipse, allowing malicious actors to gain complete system-level access to a user's device. Microsoft has previously warned against public disclosure of vulnerabilities and suggested potential legal repercussions for researchers who do so outside its protocols. Users of Microsoft Defender are advised to remain vigilant regarding this vulnerability.
Winsage
August 12, 2026
A security researcher named Nightmare Eclipse has discovered a vulnerability in Windows, called ShieldBreak, which allows hackers to gain system-wide access to users' devices and sensitive data by exploiting a flaw in Windows Defender. The vulnerability affects Windows 10, Windows 11 (including version 25H2), and Windows Server 2025. A proof-of-concept exploit has been provided, requiring users to run a Windows application to trigger the vulnerability. Security researcher Will Dormann confirmed that Windows Defender must be enabled for the exploit to work. Microsoft has not yet released a patch for ShieldBreak, which is classified as a zero-day vulnerability. This discovery follows previous vulnerabilities disclosed by Nightmare Eclipse, including RoguePlanet, for which Microsoft issued an inadequate patch. The situation has heightened tensions between the researcher and Microsoft regarding the handling of bug reports, especially after Microsoft threatened legal action against researchers disclosing zero-days outside established protocols. The disclosure of ShieldBreak occurred shortly after Microsoft's monthly security patch releases, which have been increasing in number.
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