CVE-2026-95363 in Chrome
Summary
by MITRE • 09/29/2026
UI misrepresentation in FileSystem in Google Chrome prior to 154.0.8037.57 allowed a remote attacker leveraging social engineering to spoof UI elements via a crafted HTML page. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 09/29/2026
The vulnerability identified as a user interface misrepresentation within the FileSystem API of Google Chrome prior to version 154.0.8037.57 represents a significant trust boundary violation that exploits the browser's rendering engine and DOM manipulation capabilities. This flaw allows an attacker, through social engineering tactics such as hosting a malicious webpage or embedding crafted HTML content in a phishing email, to deceive users by spoofing critical UI elements. The core technical issue lies in the improper handling of file system interactions where the visual representation presented to the user does not accurately reflect the underlying operations being performed on their local storage. By manipulating the Document Object Model (DOM) and leveraging CSS styling or JavaScript-based overlay techniques, an attacker can create a false sense of security or urgency, making legitimate browser dialogs appear as malicious prompts or vice versa. This discrepancy between what is displayed and what actually occurs undermines the user's ability to make informed decisions regarding data access and modification.
From a technical perspective, this vulnerability aligns with CWE-201: Insertion of Sensitive Information into Sent Data, specifically in the context of UI deception where sensitive operational states are misrepresented to the end-user. It also closely maps to ATT&CK technique T1657: Impersonation, which involves attackers mimicking legitimate entities or processes to gain trust and execute malicious actions without detection. The severity is classified as Medium because while it does not directly allow for arbitrary code execution or remote shell access, it serves as a powerful vector for credential harvesting, malware installation, or unauthorized data exfiltration by bypassing user awareness mechanisms. Attackers can craft scenarios where the victim believes they are interacting with a trusted service provider when in reality they are granting permissions to a malicious script that accesses sensitive files stored on their device via the FileSystem API.
The operational impact of this vulnerability is primarily centered around social engineering success rates and data integrity risks. When users cannot reliably distinguish between legitimate browser interfaces and spoofed overlays, they may inadvertently approve requests for read/write access to directories containing personal documents, financial records, or corporate secrets. This erosion of trust in the user interface can lead to significant privacy breaches and potential compliance violations depending on the sensitivity of the accessed data. Furthermore, because modern web applications increasingly rely on local storage mechanisms like IndexedDB and the File System Access API for offline functionality and performance optimization, the attack surface for such UI spoofing attacks continues to expand. Users who are not vigilant about verifying URL bars or dialog origins become prime targets for these deceptive practices.
Mitigation strategies must focus on both immediate patching and long-term architectural improvements. The primary remediation is to upgrade Google Chrome to version 154.0.8037.57 or later, where the Chromium team has addressed the underlying logic errors that permitted this UI manipulation. For organizations managing large fleets of browsers, deploying automated update policies ensures consistent protection against such vulnerabilities. Additionally, security awareness training should emphasize verifying the authenticity of dialogs and checking for secure connection indicators before interacting with any file system prompts. Developers integrating third-party scripts or iframes must implement strict Content Security Policy (CSP) directives to prevent unauthorized DOM manipulation that could facilitate UI spoofing. Regular audits of web applications using FileSystem APIs can also help identify potential misuse patterns early, reducing the risk of exploitation in production environments.