CVE-2026-106329 in Chrome
Summary
by MITRE • 10/07/2026
Incorrect authorization in FileSystem in Google Chrome prior to 155.0.8059.39 allowed a remote attacker leveraging social engineering to potentially execute arbitrary code outside the sandbox via a crafted HTML page. (Chromium security severity: High)
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Analysis
by VulDB Data Team • 10/07/2026
The vulnerability identified as an incorrect authorization flaw within the FileSystem API of Google Chrome prior to version 155.0.8059.39 represents a significant breach in browser-based access control mechanisms. This issue stems from improper validation or enforcement of permissions when applications attempt to interact with the user's local file system through web pages. In modern browsers, the File System Access API is designed to provide websites with controlled read and write access to files on the user's device, but this interaction must be strictly gated by explicit user consent and precise scope limitations. The flaw in question indicates that under specific conditions, the browser failed to correctly verify whether a web page had legitimate authorization to perform file system operations beyond its intended sandbox boundaries. This breakdown in permission checks allows a malicious actor to bypass standard security restrictions that are meant to isolate web content from the underlying operating system.
From an operational perspective, this vulnerability enables a remote attacker to execute arbitrary code outside of the browser's secure sandbox environment through social engineering tactics. The attack vector typically involves crafting a deceptive HTML page or phishing site that tricks the user into granting permissions for file access. Once the victim interacts with the malicious content and grants what appears to be a benign permission, such as opening a document or saving a file, the underlying logic flaw allows the script to escalate its privileges. Instead of being confined to reading or writing within an approved directory structure, the attacker can manipulate paths or exploit race conditions in the authorization logic to access sensitive areas of the file system that should remain inaccessible. This effectively breaks the sandbox isolation model, which is a fundamental security feature designed to prevent web content from affecting other parts of the user's computer.
The impact of this vulnerability extends beyond simple data exfiltration and includes the potential for full remote code execution on the victim's machine. By leveraging social engineering to gain initial foothold via permission grants, an attacker can deploy malware, steal sensitive documents stored locally, or use the compromised browser instance as a pivot point for further network attacks. The severity of this issue is classified as High by Chromium security standards because it directly undermines the trust model that users rely on when browsing the web. Users expect their browsers to act as secure containers, and any ability for external content to escape these boundaries poses a critical risk to personal privacy and system integrity.
To mitigate this vulnerability, organizations and individual users must ensure that Google Chrome is updated to version 155.0.8059.39 or later immediately upon availability. This update contains the necessary patches to correct the authorization logic within the FileSystem API implementation. Additionally, security awareness training should be emphasized for end-users to recognize social engineering attempts that seek to manipulate permission dialogs. Users should critically evaluate any request from a web page to access local files and verify the legitimacy of the source before granting consent. Implementing strict content security policies and utilizing browser extensions that monitor or restrict file system API usage can provide an additional layer of defense against exploitation of this flaw in environments where immediate patching may not be feasible.
This vulnerability aligns with CWE-269, which describes Improper Privilege Management, as the core issue lies in the failure to properly enforce access controls for a privileged operation. Furthermore, it relates to ATT&CK technique T1059, Command and Scripting Interpreter, specifically within the context of client-side execution where malicious scripts are used to achieve objectives outside the intended sandboxed environment. The exploitation path also reflects aspects of CWE-749, Exposed Dangerous Method or Function, as the FileSystem API exposes powerful system capabilities that were not adequately restricted for untrusted web content. Addressing this issue requires both technical patching and continued vigilance against social engineering attacks that serve as the primary delivery mechanism for such exploits.