CVE-2026-11263: Google Chrome Information Disclosure Flaw

CVE-2026-11263 Overview

CVE-2026-11263 is an insufficient policy enforcement vulnerability in the WebAuthentication component of Google Chrome on Android versions prior to 149.0.7827.53. A remote attacker who has already compromised the renderer process can leak cross-origin data through a crafted HTML page. The vulnerability is tracked under [CWE-693: Protection Mechanism Failure] and carries Chromium's internal severity rating of Low, while NVD scores it as Medium.

Exploitation requires user interaction and a previously compromised renderer process, which raises the attacker effort needed for a successful chain. Successful exploitation breaks the same-origin policy enforced by WebAuthentication and exposes data from other origins.

Critical Impact
An attacker controlling a compromised renderer process can bypass WebAuthentication policy checks and exfiltrate sensitive cross-origin data from a victim's browser session on Android.

Affected Products

Google Chrome on Android prior to 149.0.7827.53
Google Android (host operating system for the affected Chrome browser)
Chromium-based browsers on Android that inherit the WebAuthentication implementation prior to milestone 149

Discovery Timeline

2026-06-05 - CVE-2026-11263 published to NVD
2026-06-08 - Last updated in NVD database

Technical Details for CVE-2026-11263

Vulnerability Analysis

The vulnerability resides in the WebAuthentication (WebAuthn) implementation in Chrome for Android. WebAuthn provides browser APIs for public-key credential creation and assertion, and it relies on strict origin-bound policy enforcement to prevent one site from accessing credentials or signals tied to another origin.

In affected builds, the policy checks within the WebAuthentication code path are insufficient. When an attacker has already gained code execution inside a renderer process, the missing or weakened policy enforcement allows that renderer to interact with WebAuthn flows in a way that surfaces data belonging to other origins. The classification as [CWE-693: Protection Mechanism Failure] reflects that the security control exists but does not adequately constrain cross-origin behavior.

The issue is not a direct memory corruption or remote code execution primitive. Instead, it acts as an escalation aid in multi-stage exploit chains where the attacker first achieves renderer compromise and then leverages this flaw to widen the impact into a cross-origin information disclosure.

Root Cause

The root cause is incomplete enforcement of origin and policy boundaries inside the WebAuthentication module. The component does not consistently validate that requests and responses are scoped to the legitimate origin once the renderer process is no longer trusted, which violates the assumptions of the same-origin model used elsewhere in the browser.

Attack Vector

The attack is network-based and requires user interaction, typically by loading attacker-controlled content. The attacker must already control a compromised renderer process, generally chained with a prior renderer-side vulnerability. From that position, a crafted HTML page triggers WebAuthentication operations that return or expose data from cross-origin contexts.

No authenticated session with the target origin is required from the attacker, and confidentiality of cross-origin data is the primary impact. Integrity and availability are not affected. Technical details are tracked in the Chromium Issue Tracker entry.

Detection Methods for CVE-2026-11263

Indicators of Compromise

Android devices running Chrome versions earlier than 149.0.7827.53 accessing untrusted web content
Browser telemetry showing WebAuthentication API calls originating from pages immediately after suspected renderer exploitation attempts
Unexpected outbound requests from mobile endpoints following visits to attacker-controlled URLs delivered via phishing or malvertising

Detection Strategies

Inventory Chrome versions across managed Android fleets and flag any instance below 149.0.7827.53 as vulnerable
Correlate mobile browser crash reports and renderer sandbox anomalies with subsequent WebAuthn-related network activity
Monitor web proxy and DNS logs for traffic to known exploit-hosting infrastructure that targets Chromium renderer bugs

Monitoring Recommendations

Enable enterprise reporting from Chrome on Android via Chrome Browser Cloud Management to capture version and extension state
Forward mobile EDR and MDM telemetry into a centralized data lake for correlation with browser version data and web access logs
Track CVE references and Chromium issue 500044225 in vulnerability management workflows to confirm remediation status

How to Mitigate CVE-2026-11263

Immediate Actions Required

Update Google Chrome on all Android devices to version 149.0.7827.53 or later through the Google Play Store or enterprise mobile management
Audit mobile device fleets to identify endpoints running outdated Chrome builds and prioritize them for forced update
Restrict access to untrusted web content from corporate Android devices until patches are confirmed deployed

Patch Information

Google addressed the vulnerability in Chrome 149.0.7827.53 on Android. Refer to the Google Chrome Update Announcement for release details and the Chromium Issue Tracker entry for the underlying bug record. Apply the update through Google Play or managed app deployment channels.

Workarounds

Use mobile device management policies to enforce minimum Chrome version requirements on Android endpoints
Deploy web filtering on mobile networks to block known malicious domains that host renderer exploitation payloads
Encourage users to avoid clicking untrusted links and to keep Google Play auto-updates enabled for the Chrome application

bash

# Verify installed Chrome version on an Android device via adb
adb shell dumpsys package com.android.chrome | grep versionName

# Force an update check through the Play Store on a managed device
adb shell am start -a android.intent.action.VIEW \
  -d "market://details?id=com.android.chrome"