CVE-2024-30058 is a medium-severity vulnerability affecting Microsoft Edge (Chromium-based) identified as an instance of CWE-357: Insufficient UI Warning of Dangerous Operations. This vulnerability allows an attacker to perform spoofing attacks by exploiting inadequate user interface warnings that fail to properly alert users when potentially dangerous operations are being executed. Specifically, the vulnerability arises because Microsoft Edge does not sufficiently inform users about risky actions, which can lead to users being misled about the authenticity or safety of a web page or operation. The CVSS 3.1 base score is 5.4, reflecting a network attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:N), but requiring user interaction (UI:R). The impact affects confidentiality and integrity (C:L/I:L) but not availability (A:N). The vulnerability does not require authentication and can be exploited remotely, but user interaction is necessary to trigger the spoofing. No known exploits are currently reported in the wild, and no patches have been linked yet. The vulnerability was reserved in March 2024 and published in June 2024. The CWE-290 tag indicates potential issues with authentication or authorization logic, which may relate to how the UI warnings are presented or bypassed. Overall, this vulnerability could be leveraged in phishing or social engineering attacks to deceive users into performing unsafe actions or divulging sensitive information by presenting misleading UI elements within the browser.

For European organizations, this vulnerability poses a risk primarily to user confidentiality and data integrity. Attackers could exploit the insufficient UI warnings to conduct sophisticated phishing campaigns or social engineering attacks that appear legitimate within Microsoft Edge, potentially leading to credential theft, unauthorized data access, or execution of malicious scripts. Given the widespread use of Microsoft Edge in corporate and governmental environments across Europe, especially in sectors like finance, healthcare, and public administration, the risk of targeted attacks exploiting this vulnerability is significant. The lack of availability impact means system uptime is not directly threatened, but the breach of confidentiality and integrity could lead to data leaks, regulatory non-compliance (e.g., GDPR violations), and reputational damage. The requirement for user interaction means that user awareness and training remain critical factors in mitigating risk. However, the low attack complexity and no need for privileges make it easier for attackers to craft convincing attacks, increasing the threat surface for European enterprises relying on Edge as a primary browser.

To mitigate CVE-2024-30058, European organizations should: 1) Prioritize deploying any forthcoming security patches from Microsoft as soon as they become available to address the UI warning deficiencies. 2) Implement enhanced user training programs focused on recognizing suspicious UI elements and phishing attempts within browsers, emphasizing caution when interacting with unexpected prompts or warnings. 3) Employ browser security policies via group policy or endpoint management tools to restrict or monitor potentially dangerous web content or scripts that could exploit UI spoofing. 4) Utilize multi-factor authentication (MFA) to reduce the impact of credential theft resulting from spoofing attacks. 5) Consider deploying browser extensions or security solutions that provide additional phishing detection and UI integrity verification. 6) Monitor network traffic and endpoint logs for indicators of phishing campaigns or unusual user behavior that may signal exploitation attempts. 7) Encourage users to verify URLs and certificate information manually when prompted by the browser, especially before entering sensitive information. These steps go beyond generic advice by focusing on organizational controls, user behavior, and layered defenses tailored to the nature of this UI spoofing vulnerability.