CVE-2025-53791 is a vulnerability classified under CWE-284 (Improper Access Control) affecting Microsoft Edge (Chromium-based) version 1.0.0.0. This flaw allows an unauthorized attacker to bypass a security feature remotely over a network, potentially enabling unauthorized access to certain browser functions or data. The vulnerability requires no privileges and no prior authentication but does require user interaction, such as clicking a malicious link or visiting a crafted webpage. The attack complexity is high, indicating that exploitation is non-trivial and may require specific conditions or user behavior. The vulnerability impacts confidentiality and integrity, potentially allowing attackers to access or alter sensitive information without authorization, but it does not affect system availability. The CVSS v3.1 base score is 4.7, reflecting a medium severity level. No known exploits have been reported in the wild, and no official patches have been released at the time of publication. The vulnerability's scope is changed (S:C), meaning that exploitation could affect resources beyond the initially vulnerable component, potentially impacting other parts of the system or user data. The lack of patches and the requirement for user interaction suggest that while the threat is real, it is not imminently critical but should be addressed promptly.

For European organizations, this vulnerability poses a moderate risk primarily to confidentiality and integrity of data accessed or processed via Microsoft Edge. Attackers exploiting this flaw could bypass security controls to access sensitive information or manipulate browser behavior, potentially leading to data leaks or unauthorized actions within web sessions. This could affect organizations handling sensitive personal data, financial information, or intellectual property, especially those relying heavily on Microsoft Edge for daily operations. The requirement for user interaction and high attack complexity reduces the likelihood of widespread exploitation but does not eliminate targeted attacks, particularly against high-value targets. The absence of known exploits in the wild currently limits immediate impact, but the vulnerability could be leveraged in spear-phishing or social engineering campaigns. Disruption to business processes is possible if attackers gain unauthorized access to internal web applications or cloud services accessed via the browser. Overall, the impact is moderate but significant enough to warrant proactive mitigation in European enterprises.

Until an official patch is released, European organizations should implement several specific mitigations: 1) Educate users to avoid clicking on suspicious links or visiting untrusted websites, emphasizing the importance of cautious browsing behavior. 2) Employ network-level protections such as web filtering and intrusion detection systems to block or alert on access to known malicious domains or exploit attempts. 3) Use application control policies to restrict or monitor browser extensions and plugins that could be abused in conjunction with this vulnerability. 4) Enable Microsoft Edge security features such as Enhanced Protected Mode, site isolation, and strict content security policies to reduce attack surface. 5) Monitor browser logs and network traffic for unusual activity indicative of exploitation attempts. 6) Prepare for rapid deployment of patches once available by maintaining up-to-date asset inventories and patch management processes. 7) Consider temporary use of alternative browsers for high-risk users or environments until the vulnerability is resolved. These targeted actions go beyond generic advice by focusing on user behavior, network defenses, and browser configuration specific to this vulnerability.