Microsoft Word Zero-Day Vulnerability (CVE-2026-21514) Exploited in the Wild
On February 10, 2026, security researchers disclosed CVE-2026-21514, a critical zero-day vulnerability in Microsoft Word that allows attackers to bypass key security protections. The flaw, classified under CWE-807 (improper security decision-making based on untrusted inputs), exploits weaknesses in how Word processes Object Linking and Embedding (OLE) controls.
OLE enables documents to embed and interact with external objects, but the vulnerability permits attackers to circumvent Microsoft’s mitigations against malicious COM/OLE controls. This bypass could facilitate unauthorized code execution or further exploitation when users open specially crafted documents.
Reports confirm active exploitation in the wild, with threat actors leveraging the flaw to deliver phishing attacks via compromised enterprise email accounts. The vulnerability poses a significant risk to organizations relying on Microsoft Office for document processing, particularly those handling sensitive or high-value data.
Microsoft has not yet released a patch for CVE-2026-21514, leaving users exposed until an official fix is deployed. Security teams are advised to monitor for updates and implement mitigations where possible.
Source: https://www.linkedin.com/feed/update/urn:li:activity:7427536345994088448
Microsoft Security cybersecurity rating report: https://www.rankiteo.com/company/microsoft-security
"id": "MIC1770865108",
"linkid": "microsoft-security",
"type": "Vulnerability",
"date": "2/2026",
"severity": "85",
"impact": "4",
"explanation": "Attack with significant impact with customers data leaks"{'affected_entities': [{'customers_affected': 'Organizations relying on '
'Microsoft Office for document '
'processing',
'industry': 'Software',
'location': 'Global',
'name': 'Microsoft',
'size': 'Large',
'type': 'Technology Company'}],
'attack_vector': 'Phishing (malicious Word documents)',
'date_detected': '2026-02-10',
'date_publicly_disclosed': '2026-02-10',
'description': 'On February 10, 2026, security researchers disclosed '
'CVE-2026-21514, a critical zero-day vulnerability in '
'Microsoft Word that allows attackers to bypass key security '
'protections. The flaw exploits weaknesses in how Word '
'processes Object Linking and Embedding (OLE) controls, '
'permitting attackers to circumvent Microsoft’s mitigations '
'against malicious COM/OLE controls. This bypass could '
'facilitate unauthorized code execution or further '
'exploitation when users open specially crafted documents. '
'Reports confirm active exploitation in the wild, with threat '
'actors leveraging the flaw to deliver phishing attacks via '
'compromised enterprise email accounts.',
'impact': {'operational_impact': 'Potential unauthorized code execution',
'systems_affected': 'Microsoft Word (OLE/COM processing)'},
'post_incident_analysis': {'root_causes': 'Weaknesses in how Microsoft Word '
'processes OLE controls, leading to '
'improper security decision-making '
'(CWE-807).'},
'recommendations': 'Security teams are advised to monitor for updates and '
'implement mitigations where possible.',
'references': [{'source': 'Security Researchers'}],
'title': 'Microsoft Word Zero-Day Vulnerability (CVE-2026-21514) Exploited in '
'the Wild',
'type': 'Zero-Day Vulnerability Exploitation',
'vulnerability_exploited': 'CVE-2026-21514 (CWE-807 - Improper security '
'decision-making based on untrusted inputs)'}