CVE-2025-53791 is classified under CWE-284 (Improper Access Control) and affects Microsoft Edge (Chromium-based) version 1.0.0.0. The vulnerability allows an attacker without privileges to bypass a security feature remotely over a network, but requires user interaction, such as clicking a malicious link or visiting a crafted webpage. The CVSS 3.1 base score is 4.7 (medium), reflecting low confidentiality and integrity impact, no availability impact, and high attack complexity. The scope is changed, meaning the vulnerability affects components beyond the initially vulnerable part. The vulnerability arises from insufficient enforcement of access control mechanisms within Edge, potentially allowing unauthorized access to sensitive browser features or data. No patches or known exploits are currently available, indicating the vulnerability is newly disclosed and unexploited in the wild. The attack vector is network-based, so remote attackers can attempt exploitation without local access or privileges. However, the requirement for user interaction and high attack complexity reduces the likelihood of widespread exploitation. This vulnerability highlights the importance of robust access control in browser security, especially given Edge's integration with Windows environments and enterprise use.

For European organizations, this vulnerability could lead to unauthorized access to sensitive browser data or features, potentially exposing confidential information or allowing limited manipulation of browser behavior. Although the impact on availability is none, the confidentiality and integrity risks could affect organizations handling sensitive data, including financial, governmental, and healthcare sectors. The requirement for user interaction means phishing or social engineering campaigns could be vectors, increasing risk to end users. Organizations relying heavily on Microsoft Edge for web applications or internal portals may face increased exposure. However, the high attack complexity and lack of known exploits reduce immediate risk. Still, the vulnerability could be leveraged in targeted attacks against high-value European entities, especially those with less mature endpoint security or user training. The medium severity suggests a moderate but non-critical threat level, warranting prompt attention but not emergency response.

1. Limit exposure of Microsoft Edge to untrusted networks by enforcing strict network segmentation and firewall rules. 2. Educate users to recognize and avoid phishing attempts or suspicious links that could trigger the required user interaction for exploitation. 3. Employ endpoint detection and response (EDR) solutions to monitor for anomalous browser behaviors indicative of exploitation attempts. 4. Restrict browser extensions and plugins to reduce attack surface and potential privilege escalation paths. 5. Apply principle of least privilege on user accounts to minimize impact if exploitation occurs. 6. Monitor official Microsoft channels for patches or updates addressing this vulnerability and prioritize timely deployment once available. 7. Consider deploying application control policies to restrict execution of untrusted code within the browser context. 8. Conduct regular security awareness training emphasizing safe browsing habits. 9. Use network-level protections such as web proxies or secure web gateways to filter malicious content. 10. Audit and review browser configurations and security settings to ensure they follow best practices.