In May 2025, a significant security vulnerability, identified as CVE-2025-5065, was discovered in the Chromium project's FileSystemAccess API. This flaw, categorized as an "inappropriate implementation," posed potential risks to users of Chromium-based browsers, including Google Chrome and Microsoft Edge.
Understanding the FileSystemAccess API
The FileSystemAccess API is designed to grant web applications direct access to a user's local file system, enabling functionalities such as reading, writing, and modifying files. This API enhances web applications by allowing them to handle files more efficiently, bridging the gap between web and native applications.
Details of CVE-2025-5065
CVE-2025-5065 was identified as an inappropriate implementation within the FileSystemAccess API. While specific technical details are limited, such vulnerabilities typically involve improper handling of file system permissions or inadequate validation of user inputs. This could potentially allow malicious web applications to access or modify files without proper authorization, leading to unauthorized data exposure or manipulation.
Impact on Microsoft Edge
Microsoft Edge, being built upon the Chromium engine, inherits both its features and vulnerabilities. Consequently, the CVE-2025-5065 vulnerability affected Edge users as well. Microsoft acknowledged this issue and addressed it in their security update guide, emphasizing the importance of updating to the latest browser version to mitigate potential risks.
Mitigation Measures
To protect against potential exploitation of this vulnerability, users are strongly advised to:
- Update Browsers Promptly: Ensure that Microsoft Edge and other Chromium-based browsers are updated to their latest versions, as patches addressing CVE-2025-5065 have been released.
- Exercise Caution with Web Applications: Be vigilant when granting file system access to web applications. Only permit access to trusted applications and avoid interacting with unfamiliar or suspicious websites.
- Regularly Review Permissions: Periodically check and manage the permissions granted to web applications, revoking any that are no longer necessary or seem excessive.
The discovery of CVE-2025-5065 underscores the importance of continuous vigilance in the realm of web security. As web applications become more integrated with local system resources, ensuring the secure implementation of APIs like the FileSystemAccess API is paramount. Users and developers alike must stay informed about potential vulnerabilities and adopt proactive measures to safeguard sensitive data.
Source: MSRC Security Update Guide - Microsoft Security Response Center
