CVE-2026-11274: Google Chrome Auth Bypass Vulnerability

CVE-2026-11274 Overview

CVE-2026-11274 is a navigation restriction bypass in the DOM Distiller component of Google Chrome on iOS. The flaw affects versions prior to 149.0.7827.53 and allows a remote attacker to bypass navigation restrictions through a crafted HTML page. Google classifies the underlying Chromium security severity as Low. The issue is categorized under CWE-284: Improper Access Control.

Exploitation requires user interaction, such as visiting an attacker-controlled web page. The vulnerability does not affect confidentiality or availability but can cause limited integrity impact by circumventing browser navigation policy on iOS devices.

Critical Impact

A crafted HTML page can bypass Chrome iOS navigation restrictions, enabling content presentation or redirection outside intended security boundaries.

Affected Products

• Google Chrome on iOS prior to 149.0.7827.53
• Apple iPhone OS (iOS) running affected Chrome builds
• DOM Distiller component within Chrome on iOS

Discovery Timeline

• 2026-06-05 - CVE-2026-11274 published to NVD
• 2026-06-09 - Last updated in NVD database

Technical Details for CVE-2026-11274

Vulnerability Analysis

The vulnerability resides in DOM Distiller, the Chrome component that produces simplified reader-mode views of web articles. On iOS builds prior to 149.0.7827.53, DOM Distiller does not consistently enforce the browser's navigation restrictions when processing distilled content. A remote attacker can craft an HTML page that, when distilled and rendered, drives navigation to destinations the browser would otherwise block.

The practical impact is limited integrity loss. An attacker can manipulate the user's navigation flow, potentially facilitating phishing or content spoofing. The flaw does not yield code execution, sandbox escape, or direct data disclosure. Chromium engineers triaged the issue with a Low security severity rating.

Root Cause

The root cause is improper access control [CWE-284] within DOM Distiller's handling of navigation events originating from distilled documents. The component fails to apply the same navigation policy checks used in the standard rendering path. This inconsistency in policy enforcement between distilled and non-distilled contexts creates the bypass.

Attack Vector

Exploitation occurs over the network and requires user interaction. The attacker hosts a crafted HTML page and convinces the victim to load it in Chrome on iOS, typically through reader mode or a distilled-content surface. No authentication is required. Successful exploitation lets the attacker steer the browser past navigation restrictions intended to block specific URL schemes or origins. See the Chromium Issue Tracker #501760514 for technical specifics.

Detection Methods for CVE-2026-11274

Indicators of Compromise

• Chrome on iOS builds reporting versions earlier than 149.0.7827.53 in fleet inventory
• Unusual navigation chains originating from reader-mode or distilled-content URLs (paths containing chrome-distiller references)
• User reports of unexpected redirections after opening shared article links in Chrome iOS

Detection Strategies

• Inventory Chrome iOS versions across managed devices using mobile device management (MDM) telemetry and flag any build below 149.0.7827.53.
• Monitor web proxy and DNS logs for high-volume navigation events to suspicious domains immediately following access to article-style pages.
• Correlate phishing report submissions with Chrome iOS user agent strings to identify potential targeting.

Monitoring Recommendations

• Ingest mobile browser version telemetry into the security data lake for continuous version compliance tracking.
• Track outbound URL reputation data and alert on navigation to newly registered or low-reputation domains from mobile endpoints.
• Review MDM compliance dashboards weekly to confirm Chrome iOS auto-update enforcement.

How to Mitigate CVE-2026-11274

Immediate Actions Required

• Update Google Chrome on iOS to version 149.0.7827.53 or later through the Apple App Store.
• Enforce automatic app updates on managed iOS devices via MDM policy.
• Communicate the update requirement to end users and verify compliance through device inventory reports.

Patch Information

Google published the fix in the stable channel release documented in the Google Chrome Releases blog. Installing Chrome iOS 149.0.7827.53 or later remediates the navigation restriction bypass. No configuration changes are required after the update.

Workarounds

• Disable or avoid using Chrome reader mode and distilled article views until the update is applied.
• Restrict use of Chrome on iOS in favor of a patched browser on critical devices until version compliance is verified.
• Apply MDM-based URL filtering to block known phishing infrastructure as a compensating control.

# Example: verify Chrome iOS version compliance via MDM query
# Pseudocode for an MDM-issued device query
mdm query --app com.google.chrome.ios --field CFBundleShortVersionString \
  --min-version 149.0.7827.53 \
  --noncompliant-action notify-user