CVE-2024-29057 is a medium-severity vulnerability identified in Microsoft Edge (Chromium-based) browser, specifically affecting version 1.0.0. The vulnerability is classified under CWE-357, which pertains to insufficient user interface (UI) warnings for dangerous operations. This means that the browser does not adequately alert users when they are about to perform potentially harmful actions, such as navigating to deceptive or spoofed web pages. The vulnerability is a spoofing type, where an attacker could manipulate the UI to mislead users about the true nature or origin of a web page or operation. The CVSS 3.1 base score is 4.3, indicating a medium severity level. The vector string (AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C) reveals that the attack can be executed remotely over the network without any privileges or authentication, but requires user interaction (UI:R). The impact is limited to integrity loss, with no confidentiality or availability impact. There are no known exploits in the wild at the time of publication, and no patches have been linked yet. The vulnerability was reserved and published in March 2024. The root cause is insufficient UI warnings, which can lead users to be tricked into performing unintended actions, potentially allowing attackers to manipulate browser behavior or content display to their advantage. This could facilitate phishing or social engineering attacks by making malicious sites appear legitimate or by hiding dangerous operations from the user.

For European organizations, this vulnerability poses a moderate risk primarily in the context of social engineering and phishing attacks. Since Microsoft Edge is widely used across Europe in both enterprise and consumer environments, attackers exploiting this flaw could deceive users into executing harmful actions or divulging sensitive information by presenting misleading UI elements. The integrity of user interactions could be compromised, potentially leading to unauthorized changes in browser behavior or settings. While there is no direct impact on confidentiality or availability, the indirect consequences could include credential theft, unauthorized transactions, or installation of further malware if users are tricked into unsafe operations. Organizations with high reliance on Microsoft Edge for web access, especially those in finance, government, and critical infrastructure sectors, could face increased risk of targeted phishing campaigns leveraging this vulnerability. The absence of known exploits currently reduces immediate threat, but the ease of remote exploitation combined with user interaction means that phishing attacks could become more convincing and harder to detect.

To mitigate the risk posed by CVE-2024-29057, European organizations should implement a combination of technical and user-focused measures beyond generic patching advice. First, enforce strict browser update policies to ensure that all Edge installations are upgraded promptly once a patch is released. Until then, consider deploying browser configuration policies that limit or disable potentially dangerous UI features that could be exploited for spoofing, such as suppressing certain types of pop-ups or warnings. Employ advanced email and web filtering solutions that detect and block phishing attempts exploiting UI spoofing. Conduct targeted user awareness training emphasizing the risks of spoofed browser interfaces and the importance of verifying URLs and security indicators before performing sensitive operations. Utilize endpoint protection platforms with behavioral detection to identify suspicious browser activities that may indicate exploitation attempts. For high-risk environments, consider deploying browser isolation technologies or alternative browsers with different security postures until the vulnerability is fully mitigated. Finally, monitor threat intelligence feeds for any emerging exploits related to this CVE to respond rapidly.