CVE-2025-5065 is a vulnerability identified in the FileSystemAccess API implementation within Google Chrome versions prior to 137.0.7151.55. This vulnerability stems from an inappropriate implementation that allows a remote attacker to conduct UI spoofing attacks by crafting a malicious HTML page. UI spoofing involves deceiving users by presenting fake or misleading user interface elements, potentially tricking them into performing unintended actions or divulging sensitive information. The vulnerability is classified under CWE-451, which relates to improper implementation leading to security issues. According to the CVSS v3.1 vector (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N), the attack can be executed remotely over the network without any privileges or authentication, but requires user interaction (such as visiting a malicious webpage). The impact primarily affects confidentiality, allowing attackers to potentially steal sensitive data by misleading users through spoofed UI components. There is no indication that the vulnerability affects integrity or availability. The vulnerability has a medium severity rating with a CVSS score of 6.5. As of the published date, no known exploits are reported in the wild, and no official patches or updates are linked yet, though the fixed version is indicated as 137.0.7151.55. This suggests that updating to this or later versions mitigates the issue. The vulnerability highlights the importance of secure UI design and validation in browser APIs that interact with local file systems, as improper implementation can lead to deceptive attacks that compromise user trust and data confidentiality.

For European organizations, this vulnerability poses a moderate risk primarily to confidentiality. Since Google Chrome is widely used across Europe in both enterprise and consumer environments, the potential for UI spoofing could lead to phishing attacks or data leakage if users are tricked into entering credentials or sensitive information into spoofed dialogs or interfaces. Organizations handling sensitive personal data under GDPR could face compliance risks if such data is compromised. The attack requires user interaction, so social engineering or targeted phishing campaigns could leverage this vulnerability. Sectors with high reliance on Chrome for web applications, such as financial services, healthcare, and public administration, may be particularly at risk. However, since the vulnerability does not affect integrity or availability, the operational disruption is expected to be limited. The absence of known exploits in the wild reduces immediate risk but does not eliminate the threat, especially as attackers may develop exploits once the vulnerability details are public. Organizations using Chrome in controlled environments with strict browsing policies may mitigate exposure, but remote workers and less controlled endpoints remain vulnerable.

1. Immediate update to Google Chrome version 137.0.7151.55 or later, as this version addresses the vulnerability. 2. Implement enterprise-wide browser update policies to ensure timely patching of Chrome and other critical software. 3. Educate users about phishing and UI spoofing risks, emphasizing caution when interacting with unexpected or suspicious dialogs and prompts in the browser. 4. Deploy web filtering solutions that can detect and block access to known malicious or suspicious websites that might exploit this vulnerability. 5. Use endpoint security solutions with behavioral detection capabilities to identify anomalous browser activities indicative of UI spoofing or phishing attempts. 6. For highly sensitive environments, consider restricting or monitoring the use of browser APIs that interact with the local file system, or use browser configurations that limit the FileSystemAccess API usage. 7. Monitor threat intelligence feeds for any emerging exploits targeting this vulnerability to enable rapid response.