Ethical Hacking News
A critical vulnerability has been exposed by Chaotic Eclipse that threatens Microsoft Defender's ability to protect users from a RoguePlanet zero-day attack, which grants SYSTEM-level privileges and can lead to arbitrary code execution or unauthorized actions.
Chaotic Eclipse has released a proof-of-concept (PoC) for the RoguePlanet vulnerability, known as ShieldBreak, which grants SYSTEM-level privileges. The RoguePlanet vulnerability allows an attacker to spawn a shell with elevated access rights and execute arbitrary code or unauthorized actions. Microsoft initially delayed patching the vulnerability due to defense-in-depth updates for CVE-2026-50656, but Chaotic Eclipse claims their PoC bypasses the ShieldBreak patch. The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has added CVE-2026-68820 to its Known Exploited Vulnerabilities (KEV) catalog, requiring federal agencies to apply fixes by August 25, 2026.
The cybersecurity landscape is ever-evolving, with new threats emerging daily. One such vulnerability that has garnered significant attention recently is ShieldBreak, a proof-of-concept (PoC) for a Microsoft zero-day vulnerability known as RoguePlanet. According to recent reports, Chaotic Eclipse, a security researcher also known as INFINITE NIGHTMARE, MSNightmare, and Nightmare-Eclipse, has released the PoC for ShieldBreak.
In August 2026, Chaotic Eclipse revealed that the RoguePlanet vulnerability, with a CVSS score of 7.8, grants an attacker SYSTEM-level privileges, allowing them to spawn a shell with elevated access rights and execute arbitrary code or unauthorized actions. This is described as a race condition vulnerability in Microsoft Defender for Windows.
Microsoft initially disclosed this vulnerability by describing it as a privilege escalation issue in the Microsoft Malware Protection Engine ("mpengine.dll"). However, it wasn't until almost a month later that a patch was released to address this issue. The tech giant attributed the delay in releasing the patch to the "defense-in-depth updates" introduced to mitigate CVE-2026-50656, which, according to Chaotic Eclipse, causes Defender to leak 8 bytes of data when attempting to open files in certain scenarios on Windows 11 25H2 and Windows Server 2025.
Chaotic Eclipse has claimed that Microsoft's patching efforts have failed to properly address the RoguePlanet vulnerability. According to Chaotic Eclipse, "the PoC was tested in the latest version of Windows 11 25h2 (+Canary channel) and Windows Server 2025," with a 100% success rate in bypassing the ShieldBreak patch.
This vulnerability has garnered significant attention from cybersecurity experts, who view it as a serious threat to Microsoft Defender's ability to protect users. The fact that Chaotic Eclipse claims the PoC exploits the vulnerability on both Windows 10 and Windows Server versions makes this vulnerability even more concerning for organizations with legacy systems.
Furthermore, in recent news, Microsoft has released patches for numerous security flaws, including CVE-2026-62832 (CVSS score: 7.8) and CVE-2026-68820 (CVSS score: 7.0), among others. Among these patches are fixes for the RoguePlanet vulnerability and a Windows User Profile Service privilege escalation vulnerability that allows an authorized attacker to elevate privileges locally.
Additionally, the U.S. Cybersecurity and Infrastructure Security Agency (CISA) has added CVE-2026-68820 to its Known Exploited Vulnerabilities (KEV) catalog, requiring federal agencies to apply the fixes by August 25, 2026.
This development serves as a stark reminder of the ever-evolving nature of cybersecurity threats. Organizations must remain vigilant and proactive in addressing such vulnerabilities to protect their systems and prevent potential breaches.
Related Information:
https://www.ethicalhackingnews.com/articles/A-Critical-Vulnerability-Exposed-ShieldBreak-and-RoguePlanet-Threaten-Microsoft-Defender-ehn.shtml
https://thehackernews.com/2026/08/shieldbreak-zero-day-poc-claims.html
Published: Wed Aug 12 03:24:10 2026 by llama3.2 3B Q4_K_M
