CVE-2026-14031: Google Chrome UI Spoofing Vulnerability

CVE-2026-14031 Overview

CVE-2026-14031 is a user interface (UI) spoofing vulnerability in the File Input component of Google Chrome. Versions prior to 150.0.7871.47 fail to properly render or restrict File Input behavior, allowing a remote attacker to deceive users through a crafted HTML page. The flaw is classified under [CWE-451] (User Interface Misrepresentation of Critical Information) and requires user interaction to succeed. Chromium rates the underlying security severity as Low, and no public exploit code or in-the-wild activity has been reported.

Critical Impact
A remote attacker can spoof Chrome UI elements tied to file selection, potentially tricking users into disclosing or submitting unintended files through a malicious web page.

Affected Products

Google Chrome prior to 150.0.7871.47
Chrome on Microsoft Windows
Chrome on Apple macOS and Linux distributions

Discovery Timeline

2026-06-30 - CVE-2026-14031 published to the National Vulnerability Database
2026-07-01 - Last updated in the NVD database

Technical Details for CVE-2026-14031

Vulnerability Analysis

The vulnerability resides in Chrome's File Input handling. The browser does not correctly implement rendering or interaction boundaries around the <input type="file"> control. An attacker who controls page content can layer, overlap, or otherwise manipulate the File Input surface so that users perceive a different UI state than what the browser is actually presenting. Because the flaw affects UI representation rather than memory safety, exploitation yields limited integrity impact and no direct code execution. Successful attacks depend on convincing a user to interact with the crafted page.

Root Cause

The root cause is an inappropriate implementation in the File Input control mapped to [CWE-451]. Chrome fails to enforce visual or behavioral guarantees that would prevent overlapping content, styling, or event routing from misrepresenting the file selection dialog trigger. This category of defect is common in browser chrome and DOM element boundaries, where security-critical UI must remain unambiguous to the user.

Attack Vector

Exploitation requires a victim to visit an attacker-controlled or compromised web page in a vulnerable Chrome build. The attacker crafts HTML and CSS that alter how the File Input control is perceived, enticing the user to click or drag content in a way that submits or exposes files unintentionally. No authentication is required, but user interaction is mandatory. Network access to deliver the HTML payload is the only prerequisite. Refer to the Chromium Issue Tracker Entry for the technical discussion.

Detection Methods for CVE-2026-14031

Indicators of Compromise

Chrome desktop clients reporting a version earlier than 150.0.7871.47 in browser telemetry or chrome://version inventories.
Web proxy or DNS logs showing user navigation to unknown domains immediately followed by file upload POST requests.
HTML content in web traffic that layers absolute-positioned elements or transparent overlays on top of <input type="file"> controls.

Detection Strategies

Inventory installed Chrome versions across managed endpoints and flag any host below the patched build.
Inspect outbound HTTP multipart/form-data uploads to untrusted destinations, correlating with recent browsing activity.
Hunt for suspicious HTML patterns in web gateway captures, such as file inputs styled with opacity:0 or overlaid by clickable elements.

Monitoring Recommendations

Alert when endpoints run Chrome versions older than 150.0.7871.47 after the patch rollout window.
Monitor for user reports of unexpected upload dialogs or file access prompts triggered by web pages.
Track new-domain browsing sessions where a file upload occurs within seconds of first navigation.

How to Mitigate CVE-2026-14031

Immediate Actions Required

Update Google Chrome to 150.0.7871.47 or later on all Windows, macOS, and Linux endpoints.
Force a browser restart to complete the update, since Chrome applies patches only after relaunch.
Verify enterprise policy settings enforce automatic updates and block downgrade to vulnerable builds.

Patch Information

Google addressed CVE-2026-14031 in the Chrome Stable channel release 150.0.7871.47. Deployment details are documented in the Google Chrome Update Announcement. Chromium-based browsers that consume upstream fixes should incorporate the corresponding change referenced in the Chromium Issue Tracker Entry.

Workarounds

Educate users to avoid interacting with unexpected file selection prompts on unfamiliar websites.
Restrict browsing to trusted domains through web filtering while updates propagate.
Disable file upload functionality in kiosk or high-risk profiles using Chrome enterprise policies until patching completes.

bash

# Verify installed Chrome version on Linux
google-chrome --version

# Windows registry check for enforced auto-update
reg query "HKLM\SOFTWARE\Policies\Google\Update" /v UpdateDefault