Microsoft is developing a patch to address the 'RoguePlanet' zero-day vulnerability, which exploits a race condition in Microsoft Defender. This vulnerability allows attackers to spawn a command prompt with System privileges, posing a significant threat to system security. The public proof-of-concept code has been made available, increasing the risk of exploitation. As a result, the window for patching is rapidly diminishing, making it essential for users to assess their exposure immediately1. The vulnerability is particularly concerning due to its ability to grant System privileges, allowing attackers to execute arbitrary code and gain control of the system. Microsoft's prompt action to develop a patch is crucial in mitigating the risk, but users must remain vigilant and take proactive measures to protect their systems. The 'RoguePlanet' zero-day vulnerability highlights the importance of timely patching and vulnerability management, so what matters most to practitioners is the urgent need to evaluate their systems' exposure and apply the patch as soon as it becomes available.