CVE-2024-30056 is a high-severity information disclosure vulnerability affecting Microsoft Edge based on the Chromium engine, specifically version 1.0.0. The vulnerability is categorized under CWE-359, which involves the exposure of private personal information to unauthorized actors. This flaw allows an attacker to gain access to sensitive user data without requiring any privileges or authentication, but it does require user interaction (such as visiting a malicious webpage). The CVSS 3.1 base score is 7.1, reflecting a network attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:N), but user interaction is necessary (UI:R). The impact primarily affects confidentiality (C:H), with limited impact on integrity (I:L) and no impact on availability (A:N). The vulnerability is publicly disclosed as of May 25, 2024, but there are no known exploits in the wild yet, and no official patches have been linked at this time. The vulnerability likely stems from improper handling of sensitive data within the browser, potentially through web content or browser features that inadvertently expose private information to unauthorized web actors or scripts. Since Microsoft Edge is widely used across enterprise and consumer environments, this vulnerability poses a significant risk of personal data leakage if exploited.

For European organizations, the exposure of private personal information through a widely used browser like Microsoft Edge can have serious consequences. Confidentiality breaches could lead to the leakage of sensitive customer data, employee information, or intellectual property, potentially violating GDPR and other data protection regulations, resulting in legal penalties and reputational damage. The requirement for user interaction means phishing or social engineering campaigns could be used to trigger the vulnerability, increasing the risk of targeted attacks. Since Edge is commonly deployed in corporate environments, especially in sectors such as finance, healthcare, and government, the vulnerability could be leveraged to gain footholds for further attacks or espionage. The limited impact on integrity and availability reduces the risk of system manipulation or denial of service, but the high confidentiality impact alone is critical given the regulatory environment in Europe. The absence of known exploits suggests a window for proactive mitigation before widespread exploitation occurs.

1. Immediate mitigation should include educating users to avoid interacting with suspicious links or websites, as user interaction is required to exploit this vulnerability. 2. Organizations should monitor official Microsoft communications closely for patches or updates addressing CVE-2024-30056 and prioritize rapid deployment once available. 3. Employ browser security policies via group policy or endpoint management to restrict or sandbox untrusted web content and scripts, reducing the attack surface. 4. Utilize web filtering and URL reputation services to block access to known malicious sites that could exploit this vulnerability. 5. Implement endpoint detection and response (EDR) solutions capable of detecting anomalous browser behavior indicative of exploitation attempts. 6. Consider temporarily restricting the use of Microsoft Edge version 1.0.0 in sensitive environments or deploying alternative browsers until a patch is available. 7. Conduct internal audits to identify and protect sensitive data that could be exposed and ensure data minimization principles are applied within browser contexts. These steps go beyond generic advice by focusing on user behavior, policy enforcement, and proactive monitoring tailored to the nature of this vulnerability.