CVE-2026-14031: Chrome File Input UI Spoofing Vulnerability (v150.0.7871.47)

Technical summary

CVE-2026-14031 stems from an inappropriate implementation in Chrome's File Input handling mechanism. The vulnerability allows remote attackers to craft specially designed HTML pages that visually mimic legitimate Chrome UI, exploiting insufficient input validation or improper event handling in the file dialog component. The issue is classified under CWE-451 (User Interface (UI) Misrepresentation of Critical Information), indicating the core problem involves deceiving users about what interface elements they are actually interacting with. The attack requires user interaction but does not require authentication or elevated privileges.

Business impact

UI spoofing vulnerabilities can undermine user trust and enable credential theft, social engineering, and data exfiltration. Attackers may craft convincing fake dialogs that trick users into authorizing file uploads, disclosing sensitive information, or performing unintended actions. While the integrity impact is localized and the attack requires user interaction, the reputational and operational risk is non-trivial, particularly for organizations whose users frequently interact with untrusted web content or receive phishing emails with malicious links.

Affected systems

This vulnerability affects Google Chrome installations on Windows, macOS, and Linux systems running versions prior to 150.0.7871.47. The vulnerability also impacts the underlying platform components (Windows, macOS, and Linux kernel libraries) that may be bundled with or used by Chromium-based browsers. Any organization with Chrome deployments in those environments should assess their exposure.

Exploitability

The attack vector is network-based and requires no special privileges or authentication. However, exploitation requires user interaction—the victim must visit a malicious or compromised website and interact with the spoofed UI element. The attack cannot be launched remotely without user participation. The Chromium project classified this as 'Low' severity, suggesting that in practice, the visual spoofing is difficult to execute convincingly or that user awareness provides natural defense. The CVSS 3.1 score of 4.3 (Medium) reflects the requirement for user interaction and the limited scope of impact (integrity only, no confidentiality or availability impact).

Remediation

Organizations should upgrade Google Chrome to version 150.0.7871.47 or later on all endpoints. Verify the exact patch version against Google's official release notes, as patch numbers may vary by platform or channel (stable, beta, dev). Automated patch management systems should be configured to deploy the update promptly. Given the low severity classification and requirement for user interaction, prioritization should account for business operations and change windows, though delays should be minimal.

Patch guidance

Update Chrome to 150.0.7871.47 or a later stable release. Users can check their version by navigating to Chrome Settings > About Google Chrome, which will automatically update if a newer version is available. For enterprises, leverage Chrome administrative policies and deployment tools (such as Google Update for Windows or equivalent mechanisms for macOS and Linux) to enforce and track updates across the fleet. Verify patch deployment in your endpoint management system and test within a pilot group before full rollout to ensure no compatibility issues arise.

Detection guidance

Detection is limited because UI spoofing leaves minimal forensic traces on the endpoint. Monitor for user complaints or suspicious file uploads initiated from unexpected sources or with unusual metadata. Web proxy and email gateway logs may reveal traffic to known malicious domains hosting such exploits. Endpoint Detection and Response (EDR) tools can monitor Chrome process behavior and unusual file I/O patterns, though distinguishing legitimate file dialogs from spoofed ones is inherently difficult. Focus detection efforts on identifying and blocking malicious HTML sources rather than on detecting successful exploitation post-attack.

Why prioritize this

Despite the 'Low' Chromium severity and CVSS 4.3 score, this vulnerability warrants timely patching because UI spoofing is a direct enabler of social engineering and credential theft. The attack requires user interaction but exploits cognitive trust in UI elements, making it effective in targeted attacks or mass phishing campaigns. However, it does not warrant emergency response or out-of-cycle patching; routine patch cycles within 30 days are appropriate. Prioritize based on user exposure to untrusted web content and whether the organization has seen related phishing attempts.

Risk score, explained

The CVSS 3.1 score of 4.3 (Medium) reflects: Attack Vector Network (0.85), Attack Complexity Low (0.77), no Privileges Required (0.85), User Interaction Required (0.62), Scope Unchanged (1.0), Confidentiality Impact None (0.0), Integrity Impact Low (0.22), and Availability Impact None (0.0). The 'User Interaction Required' modifier significantly lowers the score despite the ease of attack execution. The Medium severity classification is appropriate because the vulnerability enables deception and unintended user actions but does not directly compromise data confidentiality or system availability. Organizations must weigh the business risk of UI-based social engineering against the moderate CVSS rating.

Frequently asked questions