Ravie LakshmananJun 17, 2026Endpoint Security / Vulnerability
Microsoft has formally disclosed that it's working to release a patch to address a Defender zero-day codenamed RoguePlanet.
The vulnerability has now been assigned the CVE identifier CVE-2026-50656 (CVSS score: 7.8), with the tech giant describing it as a privilege escalation flaw.
"Microsoft is aware of an elevation of privilege in the Microsoft Malware Protection Engine in Microsoft Defender, publicly referred to as 'RoguePlanet,'" the company said. "We are working to provide a high-quality security update that addresses this vulnerability."
The development comes nearly a week after a security researcher named Chaotic Eclipse (aka Nightmare-Eclipse) released RoguePlanet, calling the exploit a case of a race condition that grants attackers a shell with SYSTEM-level privileges.
