CVE-2024-20675 is a security vulnerability identified in Microsoft Edge (Chromium-based) browser, classified under CWE-284, which pertains to Improper Access Control. This vulnerability allows a security feature bypass, meaning that certain security controls intended to restrict access or enforce permissions within the browser can be circumvented by an attacker. The vulnerability affects version 1.0.0 of Microsoft Edge Chromium-based browser. According to the CVSS 3.1 scoring, it has a score of 6.3, which is considered medium severity. The vector details indicate that the attack can be performed remotely (AV:N), requires low attack complexity (AC:L), does not require privileges (PR:N), but does require user interaction (UI:R). The scope is unchanged (S:U), and the impact affects confidentiality, integrity, and availability to a low degree (C:L/I:L/A:L). No known exploits are currently reported in the wild, and no patches or mitigations have been explicitly linked in the provided data. The vulnerability likely allows an attacker to bypass certain security features in the browser, potentially enabling unauthorized access to restricted browser functions or data, or enabling further exploitation chains. Since the attack requires user interaction, it might involve social engineering techniques such as convincing a user to visit a malicious website or open a crafted link. The improper access control weakness suggests that the browser's internal mechanisms for enforcing security boundaries are flawed, which could be leveraged to escalate privileges or access sensitive information within the browser context.

For European organizations, this vulnerability poses a moderate risk primarily because Microsoft Edge is widely used across enterprises and public sector entities in Europe. A successful exploitation could lead to unauthorized access to sensitive browsing data, session tokens, or internal web applications accessed via the browser, potentially compromising confidentiality and integrity of information. The requirement for user interaction reduces the likelihood of automated widespread exploitation but does not eliminate targeted attacks, especially spear-phishing or drive-by download scenarios. Organizations with high reliance on Edge for accessing internal portals or cloud services could see increased risk of data leakage or session hijacking. Additionally, if chained with other vulnerabilities, this bypass could facilitate more severe attacks such as remote code execution or lateral movement within networks. The absence of known exploits in the wild currently limits immediate threat but does not preclude future exploitation as attackers analyze the vulnerability. The medium severity rating indicates that while the vulnerability is serious, it is not critical, but it should be addressed promptly to maintain security posture.

Given the lack of an official patch link, European organizations should take proactive steps to mitigate risk. First, ensure that Microsoft Edge is updated to the latest available version beyond 1.0.0, as vendors typically release patches for such vulnerabilities soon after disclosure. Employ strict browser security policies via group policy or endpoint management tools to restrict risky behaviors such as running untrusted extensions or enabling unsafe features. Implement network-level protections such as web filtering and DNS filtering to block access to known malicious sites that could exploit this vulnerability. Educate users about the risks of interacting with unsolicited links or websites, emphasizing the need for caution to prevent social engineering exploitation. Monitor browser logs and endpoint telemetry for unusual activity that might indicate exploitation attempts. Consider deploying endpoint detection and response (EDR) solutions capable of detecting anomalous browser behavior. Finally, maintain a robust incident response plan to quickly address any suspected compromise related to browser vulnerabilities.