Critical Zero-Day Exploit in Progress: Microsoft Confirms Active Attacks on Windows Systems
Microsoft has issued an urgent security advisory warning of an actively exploited zero-day vulnerability in Windows, tracked as CVE-2024-38112, which allows attackers to execute arbitrary code with elevated privileges. The flaw, discovered by Gen Digital’s Threat Analysis Team, affects all supported versions of Windows, including Windows 10, 11, and Server 2019/2022.
The vulnerability stems from a remote code execution (RCE) weakness in the Windows MSHTML engine, a component used by Internet Explorer (IE) and other applications to render web content. Attackers are leveraging malicious Office documents to trigger the exploit, bypassing security protections and gaining full system control. Evidence suggests the campaign has been ongoing since at least June 2024, with threat actors targeting organizations in North America and Europe.
Microsoft has released out-of-band patches for the flaw, urging users to apply updates immediately. However, no workaround or mitigation is available for unpatched systems. The company has not disclosed the identity of the attackers, but the sophistication of the exploit suggests involvement by state-sponsored or advanced persistent threat (APT) groups.
The impact of this vulnerability is severe, as successful exploitation could lead to data theft, ransomware deployment, or lateral movement within networks. Security researchers warn that the exploit’s low complexity and high success rate make it a prime target for widespread abuse. Organizations are advised to prioritize patching, monitor for suspicious Office document activity, and review logs for signs of compromise.
Microsoft TPRM report: https://www.rankiteo.com/company/microsoft-security
"id": "mic1790001640",
"linkid": "microsoft-security",
"type": "Vulnerability",
"date": "9/2026",
"severity": "100",
"impact": "5",
"explanation": "Attack threatening the organization's existence"{'affected_entities': [{'industry': 'Software',
'location': 'Global (Primarily North America and '
'Europe)',
'name': 'Microsoft',
'type': 'Technology Company'}],
'attack_vector': 'Malicious Office documents',
'customer_advisories': 'Urgent security advisory issued by Microsoft',
'data_breach': {'data_exfiltration': 'Potential data theft'},
'date_detected': '2024-06-01',
'description': 'Microsoft has issued an urgent security advisory warning of '
'an actively exploited zero-day vulnerability in Windows, '
'tracked as CVE-2024-38112, which allows attackers to execute '
'arbitrary code with elevated privileges. The flaw affects all '
'supported versions of Windows, including Windows 10, 11, and '
'Server 2019/2022. The vulnerability stems from a remote code '
'execution (RCE) weakness in the Windows MSHTML engine, '
'leveraged via malicious Office documents to bypass security '
'protections and gain full system control. Evidence suggests '
'the campaign has been ongoing since at least June 2024, '
'targeting organizations in North America and Europe.',
'impact': {'data_compromised': 'Potential data theft',
'operational_impact': 'Lateral movement within networks, '
'ransomware deployment',
'systems_affected': 'All supported versions of Windows (Windows '
'10, 11, Server 2019/2022)'},
'initial_access_broker': {'entry_point': 'Malicious Office documents'},
'investigation_status': 'Ongoing',
'post_incident_analysis': {'corrective_actions': 'Apply out-of-band patches, '
'monitor for suspicious '
'activity',
'root_causes': 'Remote code execution (RCE) '
'weakness in Windows MSHTML engine'},
'ransomware': {'data_exfiltration': 'Potential data theft'},
'recommendations': 'Prioritize patching, monitor for suspicious Office '
'document activity, and review logs for signs of '
'compromise.',
'references': [{'source': 'Gen Digital’s Threat Analysis Team'}],
'response': {'communication_strategy': 'Urgent security advisory issued',
'containment_measures': 'Out-of-band patches released',
'enhanced_monitoring': 'Monitor for suspicious Office document '
'activity, review logs for signs of '
'compromise',
'remediation_measures': 'Apply Microsoft security updates '
'immediately'},
'threat_actor': ['State-sponsored groups',
'Advanced Persistent Threat (APT) groups'],
'title': 'Critical Zero-Day Exploit in Progress: Microsoft Confirms Active '
'Attacks on Windows Systems',
'type': 'Zero-Day Exploit',
'vulnerability_exploited': 'CVE-2024-38112 (RCE in Windows MSHTML engine)'}