Spoofing Vulnerability in Microsoft Edge by Microsoft

CVE-2025-21404

What is CVE-2025-21404?

CVE-2025-21404 is a spoofing vulnerability identified in Microsoft Edge, which is a web browser based on the Chromium engine and developed by Microsoft. This vulnerability enables malicious actors to impersonate legitimate entities by deceiving users about the authenticity of web pages or their origins. If exploited, this could severely disrupt an organization by leading users to enter sensitive information into fraudulent sites, resulting in potential data breaches and loss of sensitive data.

Technical Details

CVE-2025-21404 is classified as a spoofing vulnerability, which specifically affects the way Microsoft Edge handles the verification of webpage elements. By manipulating certain aspects of the browser's presentation, an attacker could create a scenario where legitimate-looking resources appear to originate from trusted sources, even when they do not. Such vulnerabilities may stem from issues in URL handling, rendering processes, or other underlying mechanisms that fail to enforce proper identity verification for web content.

Potential Impact of CVE-2025-21404

1. Data Breaches: The most critical impact is the potential for unauthorized access to sensitive information. Users, misled into believing they are on a legitimate site, may inadvertently provide confidential data such as passwords, financial information, or corporate secrets.

2. Reputational Damage: Organizations facing a security incident due to this vulnerability may suffer from significant reputational harm. Loss of trust from customers and stakeholders can lead to long-term financial consequences and diminished brand value.

3. Increased Attack Surface: Exploitation of this vulnerability can pave the way for further attacks within an organization. Once an attacker has acquired sensitive information or access credentials, they may leverage this to gain deeper access and execute more severe attacks, including lateral movement within the network.

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