CVE-2024-26247 is a security feature bypass vulnerability classified under CWE-269 (Improper Privilege Management) affecting Microsoft Edge (Chromium-based). This vulnerability arises from improper handling of privilege levels within the browser, allowing an attacker to bypass certain security features designed to restrict or control privilege escalation. Specifically, the flaw enables an attacker to perform actions that should require higher privileges without having those privileges, potentially leading to unauthorized modification of browser settings or behavior. The vulnerability affects version 1.0.0 of Microsoft Edge Chromium-based browsers and was published on March 22, 2024. The CVSS 3.1 base score is 4.7, indicating a medium severity level. The vector details (AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N/E:U/RL:O/RC:C) show that the attack can be executed remotely over the network with low attack complexity, requires no privileges but does require user interaction (such as clicking a malicious link), and impacts the integrity of the system without affecting confidentiality or availability. The scope is changed, meaning the vulnerability can affect components beyond the initially vulnerable component. No known exploits are currently reported in the wild, and no patches have been linked yet. The vulnerability could be leveraged by attackers to bypass security restrictions within the browser, potentially enabling limited unauthorized actions that degrade the integrity of the browsing environment or user data managed by the browser. However, it does not directly compromise confidentiality or availability.

For European organizations, this vulnerability poses a moderate risk primarily to the integrity of browser operations and potentially to the security posture of web-based applications accessed via Microsoft Edge Chromium. Since Edge is widely used in enterprise environments across Europe, especially in countries with strong Microsoft ecosystem adoption such as Germany, France, the UK, and the Netherlands, the vulnerability could be exploited to bypass security controls, leading to unauthorized changes in browser behavior or settings. This could facilitate further attacks such as phishing, drive-by downloads, or manipulation of web content integrity. While the vulnerability does not directly lead to data leakage or system downtime, the integrity compromise can undermine trust in web applications and potentially serve as a stepping stone for more severe attacks if combined with other vulnerabilities. Organizations handling sensitive data or critical infrastructure should be particularly cautious, as even limited privilege bypasses can be leveraged in complex attack chains. The requirement for user interaction reduces the risk somewhat but does not eliminate it, especially in environments where social engineering is prevalent.

1. Implement strict browser usage policies that limit the use of Microsoft Edge Chromium to trusted sites and users, reducing exposure to malicious content that could trigger the vulnerability. 2. Employ endpoint protection solutions that monitor and block suspicious browser behaviors indicative of privilege bypass attempts. 3. Educate users on the risks of interacting with unsolicited links or content, emphasizing caution with email attachments and links from unknown sources. 4. Use application control or sandboxing technologies to isolate browser processes and limit the impact of any privilege bypass. 5. Monitor for updates from Microsoft and prioritize deployment of patches as soon as they become available, even though no patch is currently linked. 6. Consider deploying browser security extensions or policies that enforce strict content security policies (CSP) and disable potentially risky features that could be exploited. 7. Conduct regular security assessments and penetration testing focusing on browser security to detect potential exploitation attempts early. 8. For organizations with critical web applications, implement multi-factor authentication and additional layers of security to reduce the impact of any browser-based integrity compromise.