CVE-2025-49713: 
vulnerability analysis and mitigation

CVE-2025-49713 is a type confusion vulnerability discovered in Microsoft Edge (Chromium-based) that was disclosed on July 2, 2025. The vulnerability affects Microsoft Edge versions up to (excluding) 138.0.3351.65. This security flaw allows an unauthorized attacker to execute code over a network through access of resource using incompatible type (NVD, Microsoft Learn).

The vulnerability is classified as a type confusion issue (CWE-843) that occurs when accessing resources using incompatible types in Microsoft Edge. It has received a CVSS v3.1 base score of 8.8 (HIGH) with the vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H, indicating network accessibility, low attack complexity, no privileges required, and user interaction required for exploitation (NVD).

The vulnerability poses significant security risks as it allows unauthorized attackers to execute arbitrary code over a network. The high CVSS score indicates that successful exploitation could lead to complete compromise of confidentiality, integrity, and availability of the affected system (NVD).

Microsoft has released a security fix in Microsoft Edge Stable Channel Version 138.0.3351.65. Users are strongly advised to update their Microsoft Edge installations to this version or later to mitigate the vulnerability (Microsoft Learn).