RoguePlanet let hackers take over your PC. Microsoft just patched it

Microsoft patched RoguePlanet (CVE-2026-50656), a critical zero-day vulnerability in Windows Defender that allowed hackers complete system access. PCWorld reports the fix was automatically delivered through Windows Update's Malware Protection Engine to protect users from potential attacks. Security researcher Nightmare Eclipse discovered this flaw along with other Windows vulnerabilities, emphasizing the importance of keeping systems updated. About a month ago, the anonymous security researcher Nightmare Eclipse published information about RoguePlanet, a zero-day vulnerability in Microsoft's Defender security software. The vulnerability, officially designated CVE-2026-50656, can be exploited by hackers to gain full access to your computer.