Microsoft has formally acknowledged a vulnerability known as RoguePlanet, assigning it the identifier CVE-2026-50656. The flaw affects the Microsoft Malware Protection Engine used by Microsoft Defender and has been classified as an elevation-of-privilege vulnerability.<\/p>\n
Security researcher Chaotic Eclipse, also known as Nightmare-Eclipse, publicly disclosed the issue by releasing technical details and proof-of-concept code that demonstrated the reported behavior. After the initial reports emerged, Microsoft acknowledged the vulnerability, began investigating it, and later confirmed that it is developing a security update.<\/p>\n
The disclosure follows several previously reported Defender-related vulnerabilities from the same researcher, including BlueHammer, UnDefend, and RedSun, all of which have since received patches.<\/p>\n
Although Microsoft has acknowledged the issue, the company has not announced a release date for remediation and has not publicly disclosed evidence of active exploitation.<\/p>\n