Microsoft Confirms RoguePlanet Defender Zero-Day, Says Patch is in Development

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