{"cve":{"cve_id":"CVE-2026-50656","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":0.11362,"epss_percentile":0.95662,"epss_as_of":"2026-08-26","description":"Microsoft is aware of an elevation of privilege in the Microsoft Malware Protection Engine in Microsoft Defender publicly referred to as "RoguePlanet ".","published_at":"2026-06-16T18:01:33.601000Z","last_modified_at":"2026-08-12T17:17:27.983000Z","cvss_v3_score":7.8,"cvss_v3_vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:U/RC:C","cvss_v3_severity":"HIGH","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":"poc","ssvc_automatable":false,"ssvc_technical_impact":"total","cwes":["CWE-59"],"nvd_references":["https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50656"],"vuln_status":"Modified","trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-06-24T00:09:39.878444Z","updated_at":"2026-08-13T20:20:23.063882Z"},"effective_severity":"HIGH","badges":["news"],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"L","value_label":"Local"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"PR","name":"Privileges Required","value":"L","value_label":"Low"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"H","value_label":"High"},{"metric":"I","name":"Integrity","value":"H","value_label":"High"},{"metric":"A","name":"Availability","value":"H","value_label":"High"},{"metric":"E","name":"E","value":"F","value_label":"F"},{"metric":"RL","name":"RL","value":"U","value_label":"Unchanged"},{"metric":"RC","name":"RC","value":"C","value_label":"Changed"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"microsoft","vendor_name":"microsoft","product_slug":"malware-protection-engine","product_name":"malware_protection_engine","version_start":null,"version_start_inclusive":null,"version_end":null,"version_end_inclusive":null,"cpe23_uri":"cpe:2.3:a:microsoft:malware_protection_engine:-:*:*:*:*:*:*:*"},{"vendor_slug":"microsoft","vendor_name":"microsoft","product_slug":"microsoft-malware-protection-engine","product_name":"Microsoft Malware Protection Engine","version_start":null,"version_start_inclusive":null,"version_end":null,"version_end_inclusive":null,"cpe23_uri":"cve5:microsoft:microsoft-malware-protection-engine:*:*"},{"vendor_slug":"microsoft","vendor_name":"microsoft","product_slug":"microsoft-malware-protection-engine","product_name":"Microsoft Malware Protection Engine","version_start":"1.1.0.0","version_start_inclusive":true,"version_end":"1.1.26060.3008","version_end_inclusive":false,"cpe23_uri":"cve5:microsoft:microsoft-malware-protection-engine:1.1.0.0:1.1.26060.3008"}],"exploit_refs":[],"news":[{"id":1148,"source":"The Hacker News","url":"https://thehackernews.com/2026/08/shieldbreak-zero-day-poc-claims.html","title":"ShieldBreak Zero-Day PoC Claims Microsoft Defender Patch Bypass With SYSTEM Access","summary":"The security researcher going by the name Chaotic Eclipse (aka INFINITE NIGHTMARE, MSNightmare, and Nightmare-Eclipse) has released a proof-of-concept (PoC) for a new Microsoft zero-day called ShieldBreak.\n\nThe vulnerability, rooted in Microsoft Defender for Windows, demonstrates a patch bypass for CVE-2026-50656 (CVSS score: 7.8), otherwise known as RoguePlanet.\n\nRoguePlanet has been described","thumbnail_url":"https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj9fX7D-qoT4QD3pjSuUtavTiarjtyitt3-JMji-nzNa8XTKefzPp2QGMAR6FkLA8r8Ll9VVFHCMEJSKWgi5Gk0GOdYU4RA1itDyf8ZQc12IXczcxoGHKXcJ9GAWUv-fPaRhRXnDyFfxo9nhjQoJbBPxQQbixY9RxaR_Oz_NrHD2P_EMER6yKTV3nWCSAoq/s1600/zero-day.jpg","author":"info@thehackernews.com (The Hacker News)","published_at":"2026-08-12T06:41:38Z","fetched_at":"2026-08-12T08:18:53.102615Z","trending_score":0.0060600287229512755,"cve_ids":["CVE-2026-50656"]},{"id":482,"source":"The Hacker News","url":"https://thehackernews.com/2026/07/microsoft-patches-rogueplanet-defender.html","title":"Microsoft Patches RoguePlanet Defender Flaw That Can Grant SYSTEM Privileges","summary":"Microsoft has released security updates for a Defender vulnerability known as RoguePlanet, nearly a month after details of the flaw became public.\n\nThe vulnerability, tracked as CVE-2026-50656 (CVSS score: 7.8), is a privilege escalation issue in the Microsoft Malware Protection Engine (\"mpengine.dll\"), which provides scanning, detection, and cleaning capabilities for its antivirus and","thumbnail_url":"https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhuqwSaoB3zc0bIhf1aBmcHsVVAsGnRDBc681vhmlgHYy0xx5VSxyS2jqjmk-mq27QrSKPN3yorL3A7DffJYp3iMO7CY_8owm-Cn8r7IFuvqeGHTPSyiFM0KVTMTE8W0Qon84tCbzsLVNqoS5nLq1aX8_RNKg0sxa2ke4Su_p5qy9dAlFdakwYcjueBGNhD/s1600/windows.jpg","author":"info@thehackernews.com (The Hacker News)","published_at":"2026-07-09T08:48:48Z","fetched_at":"2026-07-09T10:32:40.074045Z","trending_score":4.767127456970114e-8,"cve_ids":["CVE-2026-50656"]}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50656","source_type":"VENDOR_ADVISORY","tags":["advisory"]}],"timeline":[{"type":"published","at":"2026-06-16T18:01:33.601000Z","label":"CVE published","source":null},{"type":"cvss_changed","at":"2026-06-28T17:55:22.518073Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:55:22.518073Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:55:22.518073Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"ssvc_changed","at":"2026-06-29T23:46:59.033383Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-06-29T23:46:59.033383Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-06-29T23:46:59.033383Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"first_article","at":"2026-07-09T08:48:48Z","label":"First news coverage","source":"The Hacker News"}]}