A newly disclosed Windows Defender vulnerability, tracked as CVE-2026-50656 and dubbed RoguePlanet, has raised concerns across the cybersecurity community after a working proof-of-concept (PoC) exploit was released before a security patch became available. The exploit was published on GitHub by security researcher Nightmare Eclipse on June 10, 2026, only hours after Microsoft issued its June Patch Tuesday updates. 

The RoguePlanet flaw affects Microsoft Defender and carries a CVSS 3.1 base score of 7.8 (AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H). It is categorized under CWE-362, which covers race conditions caused by improper synchronization of shared resources. Microsoft has acknowledged CVE-2...