CVE-2026-12448: Google Chrome Privilege Escalation Flaw

CVE-2026-12448 Overview

CVE-2026-12448 is a privilege escalation vulnerability in the WebView component of Google Chrome on Android. Versions of Chrome prior to 149.0.7827.155 contain an inappropriate implementation that allows a remote attacker to escalate privileges through a crafted HTML page. The flaw is categorized under [CWE-269] Improper Privilege Management. Google rates the Chromium security severity as High. Exploitation requires user interaction, typically loading attacker-controlled web content inside an affected WebView host application.

Critical Impact
A remote attacker can escalate privileges on Android devices by delivering a crafted HTML page to an application embedding the vulnerable WebView, resulting in high impact to confidentiality, integrity, and availability.

Affected Products

Google Chrome on Android prior to 149.0.7827.155
Android applications embedding the affected Chrome WebView component
Google Android devices running the vulnerable WebView system component

Discovery Timeline

2026-06-17 - CVE-2026-12448 published to the National Vulnerability Database (NVD)
2026-06-18 - Last updated in NVD database

Technical Details for CVE-2026-12448

Vulnerability Analysis

The vulnerability resides in the Android WebView implementation shipped with Google Chrome. WebView allows native Android applications to render web content using the Chromium engine. An inappropriate implementation in this component breaks the privilege boundary that should isolate untrusted web content from the embedding application context.

When an affected WebView instance processes a crafted HTML page, the attacker can perform actions that exceed the privilege level normally granted to web content. The classification under [CWE-269] indicates that the component fails to properly manage or enforce privilege assignments. Successful exploitation can extend an attacker's reach from the sandboxed renderer context into operations available to the host application.

The attack vector is network-based and exploitation complexity is low, but the attacker must convince a victim to load the malicious page inside an application that uses the vulnerable WebView. This includes the Chrome browser itself and any Android application that relies on the system WebView for rendering.

Root Cause

The root cause is an inappropriate implementation within WebView that does not correctly enforce privilege management when handling specific web content. Google has not published low-level technical details. The referenced Chromium issue tracker entry restricts access until the fix is widely deployed, consistent with Chrome's standard disclosure practice.

Attack Vector

Exploitation follows a standard web-delivery model. The attacker hosts a crafted HTML page and induces a victim to visit it through Chrome on Android or through a third-party app that loads the URL into a WebView. Once the page is parsed, the inappropriate implementation is triggered, granting the attacker elevated privileges within the application or browser context.

The vulnerability mechanism is described in prose only. See the Chromium Issue #513458233 and the Google Chrome Stable Channel Update for vendor-confirmed information.

Detection Methods for CVE-2026-12448

Indicators of Compromise

Android devices or applications running Chrome WebView builds earlier than 149.0.7827.155
Unexpected privileged actions originating from applications that embed WebView, such as access to local files, contacts, or inter-process communication channels
Network requests from mobile clients to recently registered domains hosting HTML payloads with unusual scripting patterns

Detection Strategies

Inventory Chrome and Android System WebView versions across managed mobile devices and flag installations below 149.0.7827.155
Monitor mobile application telemetry for anomalous permission usage by apps that render third-party web content via WebView
Correlate mobile browsing telemetry with threat intelligence feeds for known malicious URLs targeting Chromium privilege escalation flaws

Monitoring Recommendations

Enable Mobile Device Management (MDM) reporting of installed Chrome and WebView versions and alert on outdated builds
Log and review outbound DNS and HTTP traffic from corporate mobile devices for connections to unverified domains serving HTML content
Track Google Play Protect events and Chrome update status for fleet devices to confirm patch propagation

How to Mitigate CVE-2026-12448

Immediate Actions Required

Update Google Chrome on Android to version 149.0.7827.155 or later through the Google Play Store
Update Android System WebView to the latest available version on all managed devices
Restrict installation of applications from untrusted sources that may load malicious HTML into embedded WebView instances
Communicate the risk to users and require browser updates within a defined SLA

Patch Information

Google released the fix in Chrome 149.0.7827.155 for Android. Refer to the Google Chrome Stable Channel Update for official release notes. Updates are distributed automatically through the Google Play Store and through Android System WebView updates.

Workarounds

Avoid opening untrusted links on Android devices until Chrome and WebView are updated
Use MDM policies to enforce automatic updates of Chrome and Android System WebView
For application developers, restrict the URLs that can be loaded into embedded WebView instances using allowlists and disable unnecessary JavaScript bridges

bash

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

# Verify installed Android System WebView version
adb shell dumpsys package com.google.android.webview | grep versionName

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