CVE-2026-14066 Overview
CVE-2026-14066 is an input validation vulnerability [CWE-20] affecting Google Chrome for iOS versions prior to 150.0.7871.47. The flaw allows a remote attacker to bypass navigation restrictions when a user visits a crafted HTML page. Chromium classifies the security severity as Low, while the National Vulnerability Database (NVD) assigns a CVSS v3.1 score of 4.3 (Medium).
Exploitation requires user interaction, such as loading an attacker-controlled page, but does not require authentication. The issue affects Chrome running on Apple iOS devices only.
Critical Impact
A remote attacker can bypass navigation restrictions in Chrome for iOS through a crafted HTML page, potentially enabling redirection to attacker-controlled destinations without honoring the browser's expected navigation controls.
Affected Products
- Google Chrome for iOS versions prior to 150.0.7871.47
- Apple iPhone OS (iOS) devices running vulnerable Chrome builds
- Chromium-based navigation handling on the iOS platform
Discovery Timeline
- 2026-06-30 - CVE-2026-14066 published to the National Vulnerability Database
- 2026-07-01 - Last updated in NVD database
Technical Details for CVE-2026-14066
Vulnerability Analysis
The vulnerability resides in Chrome for iOS navigation handling. The browser fails to sufficiently validate untrusted input supplied through an HTML page, which enables an attacker to circumvent navigation restrictions the browser normally enforces. Navigation restrictions in Chrome include limits on how, when, and where a page can trigger frame or top-level navigations, and are relied upon to prevent redirection abuse and cross-context confusion.
Because the vulnerability is scoped to Chrome for iOS, the underlying implementation differs from Chrome on desktop platforms. On iOS, Chrome uses Apple's WebKit engine and layers Chromium-specific navigation logic above it, so the flaw is expected to affect that iOS-specific navigation layer rather than the Blink renderer.
The Exploit Prediction Scoring System (EPSS) currently rates the probability of exploitation at 0.244%. No public proof-of-concept, exploit code, or in-the-wild exploitation has been reported, and the issue is not listed in the CISA Known Exploited Vulnerabilities catalog.
Root Cause
The root cause is improper input validation [CWE-20] in the Chrome for iOS navigation code path. Untrusted input from a crafted HTML page is accepted and processed without adequate checks, allowing navigation restrictions to be bypassed. Details of the specific code path are tracked in Chromium Issue #503779807.
Attack Vector
Exploitation is network-based and requires user interaction. An attacker hosts a crafted HTML page and lures a Chrome for iOS user to visit it, for example through a phishing link, malicious advertisement, or compromised website. When the page loads, it triggers the navigation logic in a way that bypasses restrictions, potentially enabling redirection or navigation actions the user did not intend.
No synthetic exploit code is available for this issue. Technical specifics are limited to the vendor advisory. Refer to the Google Chrome Update Notification and the Chromium Issue #503779807 for the authoritative description.
Detection Methods for CVE-2026-14066
Indicators of Compromise
- Chrome for iOS clients reporting a version string below 150.0.7871.47 in mobile device management (MDM) or telemetry inventories.
- Unexpected navigation events in mobile web proxy logs where the referring page and landing page originate from unrelated origins with no user click event recorded.
- Users reporting redirections from a link they clicked to an unrelated destination while browsing in Chrome on iOS.
Detection Strategies
- Query MDM and endpoint inventory systems for Chrome for iOS builds and flag any version older than 150.0.7871.47.
- Monitor web gateway and proxy logs for anomalous referer chains originating from iOS Chrome user agents.
- Correlate phishing report data with iOS Chrome user agents to identify users who may have visited crafted pages targeting this issue.
Monitoring Recommendations
- Track Chrome for iOS version distribution over time and alert when vulnerable builds persist beyond a defined patch window.
- Enable URL categorization and threat intelligence feeds on the mobile web proxy to block known malicious HTML delivery infrastructure.
- Retain browser version and user-agent telemetry in the security data lake to support retrospective hunts if new indicators emerge.
How to Mitigate CVE-2026-14066
Immediate Actions Required
- Update Google Chrome for iOS to version 150.0.7871.47 or later on all managed iOS devices via the Apple App Store or an MDM-managed app deployment.
- Enforce a minimum Chrome for iOS version through MDM compliance policies and quarantine devices that do not meet it.
- Communicate the update requirement to end users and provide guidance on verifying the installed Chrome version.
Patch Information
Google addressed CVE-2026-14066 in Chrome for iOS 150.0.7871.47. The fix is delivered through the standard App Store update channel. Release information is documented in the Google Chrome Update Notification, and the underlying issue is tracked in Chromium Issue #503779807.
Workarounds
- Instruct users to avoid clicking untrusted links in email, messaging apps, or social media while running an unpatched Chrome for iOS build.
- Route mobile browser traffic through a filtering proxy or secure web gateway that blocks known malicious domains and phishing pages.
- Temporarily direct users to an alternative up-to-date browser on iOS until Chrome is updated to 150.0.7871.47 or later.
# Configuration example: enforce minimum Chrome for iOS version via MDM compliance rule
# Pseudocode for an MDM app compliance policy
app_bundle_id: com.google.chrome.ios
minimum_version: 150.0.7871.47
enforcement_action: quarantine_device
notify_user: true
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
