CVE-2026-17814: Chrome iOS Navigation Bypass Vulnerability

CVE-2026-17814 Overview

CVE-2026-17814 is an input validation vulnerability in Google Chrome for iOS prior to version 151.0.7922.72. The flaw stems from insufficient validation of untrusted input within the iOS-specific Chrome codebase. A remote attacker can bypass navigation restrictions by serving a crafted HTML page to a targeted user. Chromium security engineers rated this issue as Medium severity. The vulnerability is classified under CWE-20: Improper Input Validation.

Critical Impact
A remote attacker can bypass Chrome for iOS navigation restrictions using a crafted HTML page, enabling unintended navigation flows that may facilitate phishing or content spoofing.

Affected Products

Google Chrome for iOS prior to 151.0.7922.72
Apple iOS devices running affected Chrome versions
Users browsing untrusted web content via Chrome for iOS

Discovery Timeline

2026-07-30 - CVE-2026-17814 published to NVD
2026-07-30 - Last updated in NVD database

Technical Details for CVE-2026-17814

Vulnerability Analysis

The vulnerability resides in Chrome for iOS navigation handling. Chrome enforces navigation restrictions to prevent certain cross-origin or scheme-based transitions that could mislead users or expose sensitive contexts. Insufficient validation of untrusted input allows an attacker to craft HTML content that circumvents those checks. The result is unintended navigation behavior initiated by the browser on behalf of the victim.

Because the flaw is scoped to the iOS build of Chrome, it reflects platform-specific handling of navigation events that differs from Chrome on desktop platforms. Chrome for iOS relies on WebKit as required by Apple's App Store policy, so the defect likely involves the glue layer between Chrome's navigation logic and iOS webview primitives.

Root Cause

The root cause is improper validation of untrusted input reaching navigation-restriction logic in Chrome for iOS. Attacker-controlled fields in a crafted HTML page pass into navigation checks without adequate sanitization or type enforcement. This allows navigation actions that policy would otherwise block. Full technical details are tracked in Chromium Issue Tracker #517312048.

Attack Vector

Exploitation requires the victim to load an attacker-controlled HTML page in Chrome for iOS. No authentication is required. The attacker hosts the crafted page and induces the victim to visit it through phishing, malvertising, or a compromised site. Once loaded, the page triggers the navigation-restriction bypass without additional user interaction beyond visiting the page.

No public proof-of-concept exploit is currently listed for this CVE, and it is not present on the CISA Known Exploited Vulnerabilities catalog.

Detection Methods for CVE-2026-17814

Indicators of Compromise

Chrome for iOS clients reporting User-Agent versions below 151.0.7922.72 in web proxy or CDN logs.
Unexpected navigation sequences originating from mobile Chrome sessions, particularly rapid redirects to credential-harvesting or spoofed domains.
Outbound requests from iOS Chrome clients to newly registered or low-reputation domains hosting crafted HTML.

Detection Strategies

Inspect HTTP proxy and secure web gateway telemetry for Chrome iOS User-Agent strings and correlate versions against 151.0.7922.72.
Monitor mobile device management (MDM) inventory data to identify iOS devices running vulnerable Chrome builds.
Flag navigation chains from mobile browsers that terminate at domains previously associated with phishing infrastructure.

Monitoring Recommendations

Ingest browser version telemetry from MDM and endpoint tooling into your SIEM for continuous version-drift monitoring.
Alert on repeat visits from managed iOS devices to newly registered domains delivering HTML with suspicious navigation constructs.
Track user reports of unexpected redirects or address-bar anomalies in Chrome for iOS as potential exploitation indicators.

How to Mitigate CVE-2026-17814

Immediate Actions Required

Update Chrome for iOS to version 151.0.7922.72 or later through the Apple App Store on all managed and personal devices.
Push a mandatory app update policy via your MDM to enforce the patched Chrome version on enrolled iOS devices.
Educate users about phishing pages that abuse crafted HTML to redirect mobile browsers.

Patch Information

Google released the fix in Chrome 151.0.7922.72 for iOS. Refer to the Google Chrome Stable Update announcement for the official release notes and to Chromium Issue Tracker #517312048 for the tracked defect.

Workarounds

Use an alternative browser on iOS until Chrome is updated to 151.0.7922.72 or later.
Enforce web filtering at the network layer to block access to known phishing and low-reputation domains that host crafted HTML.
Restrict Chrome for iOS availability via MDM policies until the patched version is confirmed installed.

bash

# Example MDM query to identify vulnerable Chrome for iOS installations
# Replace with the syntax supported by your MDM platform
mdm query devices \
  --platform ios \
  --app-bundle-id com.google.chrome.ios \
  --app-version-less-than 151.0.7922.72