A newly disclosed Windows zero-day vulnerability, dubbed RoguePlanet, has been made public by security researcher Nightmare Eclipse, escalating a long-standing feud with Microsoft over vulnerability disclosure practices. The exploit code leverages a race condition issue in Microsoft Defender, potentially allowing attackers to gain SYSTEM-level privileges, although the success rate is less than 100%. This latest revelation underscores the ongoing tensions between Eclipse and Microsoft, with the researcher having released several unpatched Windows vulnerabilities in recent months. The RoguePlanet flaw poses a significant risk to Windows users, as it can be exploited before a patch is available1. As a result, the window for patching is rapidly shrinking, making it essential for users to assess their exposure to this vulnerability immediately. The disclosure of this zero-day flaw highlights the need for prompt action to mitigate potential attacks, making it crucial for practitioners to evaluate their systems' vulnerability to RoguePlanet.