CVE-2023-6512 is a vulnerability identified in Google Chrome versions prior to 120.0.6099.62, involving an inappropriate implementation in the Web Browser UI specifically related to iframe dialog context menus. The flaw allows a remote attacker to craft a malicious HTML page that can spoof the contents of an iframe's dialog context menu. This means that an attacker could deceive users by displaying fake context menu options within an iframe, potentially tricking them into performing unintended actions or divulging sensitive information. The vulnerability is classified under CWE-838, which relates to improper handling of UI elements leading to spoofing attacks. The CVSS v3.1 base score is 6.5, indicating a medium severity level. The vector details (AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N) show that the attack can be performed remotely over the network without privileges, requires user interaction (such as clicking or interacting with the iframe), and impacts the integrity of the browser UI by allowing spoofing, but does not affect confidentiality or availability. No known exploits are currently reported in the wild, and no official patches or updates are linked yet, though the fixed version is 120.0.6099.62 or later. This vulnerability primarily targets the user interface layer of the browser, which is critical as it can undermine user trust and facilitate social engineering attacks, phishing, or other forms of deception within the browser environment.

For European organizations, this vulnerability poses a moderate risk primarily through social engineering and phishing campaigns. Attackers exploiting this flaw could craft web pages that display deceptive context menus within iframes, potentially tricking employees into executing malicious actions, such as clicking on malicious links or granting permissions unknowingly. This could lead to further compromise of internal systems or data leakage. Since Google Chrome is widely used across European enterprises and public sector organizations, the attack surface is significant. The integrity of the browser UI being compromised can reduce user confidence and increase susceptibility to targeted attacks. However, the lack of impact on confidentiality and availability limits the direct damage to system resources or data theft solely from this vulnerability. The requirement for user interaction means that user awareness and training remain important factors in mitigating risk. Additionally, sectors with high reliance on secure web interactions, such as finance, healthcare, and government, may be more sensitive to such UI spoofing attacks as they can facilitate more complex multi-stage attacks.

European organizations should prioritize updating Google Chrome to version 120.0.6099.62 or later as soon as it becomes available to ensure the vulnerability is patched. In the interim, organizations can implement browser security policies that restrict iframe usage from untrusted sources, such as Content Security Policy (CSP) directives limiting frame-ancestors and frame-src to trusted domains only. User training should emphasize caution when interacting with unexpected context menus or dialog boxes, especially within embedded frames. Security teams should monitor for phishing campaigns that may leverage this vulnerability for social engineering. Deploying endpoint protection solutions with web filtering capabilities can help block access to malicious crafted HTML pages. Additionally, organizations can consider browser hardening techniques, such as disabling unnecessary plugins or extensions that might increase attack surface. Regular vulnerability scanning and penetration testing focusing on browser UI spoofing scenarios can help identify residual risks. Finally, maintaining an incident response plan that includes browser-based attack vectors will improve readiness against exploitation attempts.