[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$f98QtFQYJMs9JE8FTfJJWP8b5cTTq4WCyT-aQo_G4sIg":3},{"article":4,"iocs":48},{"id":5,"title":6,"slug":7,"summary":8,"ai_summary":9,"brief":10,"full_text":11,"url":12,"image_url":13,"published_at":14,"ingested_at":15,"relevance_score":16,"entities":17,"category_id":30,"category":31,"article_tags":35},"cd9eaf37-e31f-4678-b5bf-337d21794697","Microsoft Confirms RoguePlanet Defender Zero-Day, Says Patch is in Development","microsoft-confirms-rogueplanet-defender-zero-day-says-patch-is-in-development-a5a905","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","Microsoft has confirmed a zero-day vulnerability in Microsoft Defender, codenamed RoguePlanet, which has been assigned CVE-2026-50656. This privilege escalation flaw allows attackers to gain SYSTEM-level privileges. A security researcher named Chaotic Eclipse disclosed the exploit, noting it's a race condition that can be difficult to reproduce but works even with real-time protection enabled.","Microsoft confirms RoguePlanet zero-day in Defender, a privilege escalation flaw.","Microsoft Confirms RoguePlanet Defender Zero-Day, Says Patch is in Development Ravie LakshmananJun 17, 2026Endpoint Security \u002F 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. \"The exploit is a race condition, so it's a hit or miss,\" the researcher noted. \"I have managed to get a 100% success rate on some machines while it struggled to work on others.\" In an update shared Tuesday, the researcher added: \"I forgot to add one thing, surprisingly, the PoC for RoguePlanet works regardless if real-time protection is on or not, which is hilarious. I think it even works in the case of passive mode, but not really sure, haven't tested that.\" Microsoft told The Hacker News last week that it's aware of the reported vulnerability and that it's \"actively investigating the validity and potential applicability of these claims.\" RoguePlanet is the fourth Defender vulnerability disclosed by Chaotic Eclipse after BlueHammer (CVE-2026-33825), UnDefend (CVE-2026-45498), and RedSun (CVE-2026-41091), all of which have since been patched by Microsoft. Found this article interesting? Follow us on Google News, Twitter and LinkedIn to read more exclusive content we post. SHARE     Tweet Share Share Share SHARE  endpoint security, Microsoft Defender, privilege escalation, Vulnerability, Windows Security, Zero-Day ⚡ Top Stories This Week Chrome V8 Zero-Day CVE-2026-11645 Exploited in the Wild - Patch Now Researchers Build Self-Replicating AI Worm That Operates Entirely on Local, Open-Weight Models Microsoft Defender RoguePlanet Zero-Day Grants SYSTEM Access on Updated Windows Anthropic Releases Claude Fable 5, Its Most Powerful AI Yet, With Cyber Safeguards Microsoft Patches Record 206 Flaws, Including Three Zero-Days and Critical RCE Bugs Ivanti, Fortinet, and SAP Release Patches for Multiple Critical Vulnerabilities Cybersecurity Stars Awards 2026: Winners Announced Across 95 Categories ThreatsDay Bulletin: Worm Code Leaked, AI Agent Phished, Claude Code Patch + 28 New Stories New GreatXML Exploit Bypasses Windows BitLocker via Recovery Partition XML Files Agentjacking Attack Tricks AI Coding Agents Into Running Malicious Code China-Linked Hackers Backdoored Linux Login Software to Hide for Nearly a Decade Critical Splunk Enterprise Flaw Lets Attackers Run Code Without Authentication U.S. Orders Anthropic to Suspend Fable 5 and Mythos 5 Access for Foreign Nationals Over 400 Arch Linux AUR Packages Hijacked to Deploy Infostealer and eBPF Rootkit Palo Alto Warns of Active Exploitation of PAN-OS GlobalProtect VPN Flaw ⚡ Weekly Recap: Chrome 0-Day, UniFi Exploits, macOS Stealers, VPN Flaw and More ⭐ Featured Resources Get the 2026 Guide to Govern and Secure Enterprise AI Agents at Scale [Watch Demo] See Which Security Gaps Attackers Could Exploit First AI Can’t Stop Every Attack. Learn How Zero Trust Can Block What’s Unknown Have You Outgrown Your MDR? 7 Warning Signs Every CISO Should Check","https:\u002F\u002Fthehackernews.com\u002F2026\u002F06\u002Fmicrosoft-confirms-rogueplanet-defender_02022423645.html","https:\u002F\u002Fblogger.googleusercontent.com\u002Fimg\u002Fb\u002FR29vZ2xl\u002FAVvXsEgy3ayOlDb3vsL747G9hStxxjTd3N5i2u8hegcT_hTs4RlNqylS_HyYH4mGLQEavD-QwH3G4l-p2tE5xrXoeK-Btj5YjbENpZcnqRZ7mXCjnJgqHKaoqyE3I3yqy3tYxafbDGNOMrDsvTnJ8UKkn7DDQ8PY_sQNZI6TsNTV0lOmSqs1uxUKm3pgpmkSDpeZ\u002Fs1600\u002Fms-patch.jpg","2026-06-17T17:36:28+00:00","2026-06-17T20:00:10.535863+00:00",9,[18,21,24,27],{"name":19,"type":20},"Microsoft Defender","product",{"name":22,"type":23},"Microsoft","vendor",{"name":25,"type":26},"Chaotic Eclipse","threat_actor",{"name":28,"type":29},"RoguePlanet","campaign","80544778-fabb-4dcd-aa35-17492e5dcf4f",{"id":30,"icon":32,"name":33,"slug":34},null,"Vulnerabilities","vulnerabilities",[36,41,43],{"category":37},{"id":38,"icon":32,"name":39,"slug":40},"574f766a-fb3f-487c-8d2c-0720ae75471b","Zero-day","zero-day",{"category":42},{"id":30,"icon":32,"name":33,"slug":34},{"category":44},{"id":45,"icon":32,"name":46,"slug":47},"e7b231c8-5f79-4465-8d38-1ef13aea5a14","Threat Intelligence","threat-intelligence",[49],{"type":50,"value":51,"context":52},"cve","CVE-2026-50656","Microsoft Defender privilege escalation zero-day"]