CVE-2025-47964 is a spoofing vulnerability identified in Microsoft Edge, the Chromium-based web browser developed by Microsoft. This vulnerability affects version 1.0.0.0 of the browser and was publicly disclosed on July 11, 2025. Spoofing vulnerabilities typically allow an attacker to deceive users or systems by presenting false information, often masquerading as a legitimate entity or content. In this case, the flaw could enable an attacker to manipulate the browser's user interface or content rendering to mislead users into believing they are interacting with a trusted website or service when they are not. The CVSS v3.1 base score of 5.4 categorizes this vulnerability as medium severity. The vector string (AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N) indicates that the attack can be executed remotely over the network without requiring privileges, but it does require user interaction (such as clicking a link or visiting a malicious webpage). The impact affects confidentiality and integrity to a limited extent but does not affect availability. The vulnerability scope is unchanged, meaning it affects only the vulnerable component (Microsoft Edge) without impacting other system components. No known exploits are reported in the wild as of the publication date, and no patches or mitigation links have been provided yet. Given the nature of spoofing, the threat could be leveraged in phishing attacks, credential theft, or social engineering campaigns that exploit user trust in the browser's displayed content or URL bar. This vulnerability underscores the importance of validating the authenticity of web content and browser UI elements, especially in environments where sensitive information is handled.

For European organizations, this spoofing vulnerability in Microsoft Edge could have significant implications, particularly for sectors relying heavily on web-based applications and services, such as finance, healthcare, and government. Attackers exploiting this flaw could craft deceptive web pages that appear legitimate, potentially leading to credential harvesting, unauthorized access to sensitive data, or the spread of malware through social engineering. The medium severity rating suggests that while the vulnerability does not directly compromise system availability or allow privilege escalation, the potential for confidentiality and integrity breaches remains concerning. European organizations with employees or customers using the affected Edge version may face increased risks of phishing attacks and fraud. Additionally, regulatory frameworks such as GDPR impose strict requirements on data protection; successful exploitation resulting in data breaches could lead to legal and financial penalties. The lack of known exploits in the wild currently reduces immediate risk but does not eliminate the threat, as attackers may develop exploits once the vulnerability details become widely known. Organizations should be vigilant in monitoring for suspicious activities and educate users about the risks of interacting with untrusted web content.

Given the absence of an official patch at the time of disclosure, European organizations should implement several targeted mitigation strategies beyond generic advice. First, enforce strict browser update policies to ensure that once a patch is released, it is deployed promptly across all endpoints. Until then, consider restricting the use of the vulnerable Edge version by disabling or limiting access through endpoint management tools. Employ web filtering solutions that block access to known malicious or suspicious websites to reduce exposure to spoofing attempts. Enhance user awareness training focused on recognizing phishing and spoofing indicators, emphasizing caution with unsolicited links and unexpected web prompts. Utilize multi-factor authentication (MFA) for critical services to mitigate the impact of credential theft resulting from spoofing attacks. Monitor network traffic and endpoint logs for anomalies indicative of phishing or spoofing campaigns. Where feasible, encourage the use of alternative browsers with no known vulnerabilities of this type until the issue is resolved. Finally, maintain close communication with Microsoft and cybersecurity advisories to receive timely updates and patches.