Microsoft Defender Vulnerability Allows Attackers to Elevate Privileges
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A newly disclosed security flaw in Microsoft Defender<\/a> for Endpoint could allow attackers with local access to elevate their privileges to SYSTEM level, potentially gaining complete control over affected systems.\u00a0<\/p>\n The vulnerability, tracked as CVE-2025-26684, was patched as part of Microsoft\u2019s May 2025 Patch Tuesday security updates released yesterday.<\/p>\n Security researchers identified the vulnerability as an \u201cexternal control of filename or path\u201d weakness in Microsoft Defender for Endpoint that could be exploited by an authorized attacker to elevate privileges locally.\u00a0<\/p>\n The vulnerability received a CVSS score of 6.7 out of 10, classifying it as \u201cImportant\u201d severity rather than \u201cCritical.\u201d<\/p>\n According to the official Microsoft Security Response Center advisory, an attacker who successfully exploits this vulnerability could gain SYSTEM privileges, essentially providing them with complete control over the compromised system.\u00a0<\/p>\n This level of access would allow malicious actors to install programs, modify or delete data, and create accounts with full administrative rights.<\/p>\n \u201cThe vulnerability stems from improper validation of user-supplied input when handling file paths in Microsoft Defender for Endpoint,\u201d explains cybersecurity expert Rich Mirch from Stratascale, one of the researchers credited with discovering the flaw.\u00a0<\/p>\n \u201cWhen exploited, it allows attackers to manipulate file operations to access restricted system resources.\u201d<\/p>\n The vulnerability specifically affects Microsoft Defender for Endpoint for Linux versions<\/a> prior to 101.25XXX.\u00a0<\/p>\n Organizations running this security solution should ensure they apply the latest security update immediately.<\/p>\n Microsoft has classified the exploitability assessment as \u201cExploitation Unlikely,\u201d indicating that while the vulnerability is serious, the company believes the likelihood of widespread exploitation is relatively low.\u00a0<\/p>\n The company also confirmed that there is no evidence that this vulnerability was publicly disclosed or exploited in the wild prior to the patch release.<\/p>\n The vulnerability was discovered through coordinated vulnerability disclosure, with credit given to security researchers astraleureka and Rich Mirch from Stratascale.<\/p>\nTechnical Details of CVE-2025-26684<\/strong><\/h2>\n