CVE-2026-11270: Google Chrome Information Disclosure Flaw

CVE-2026-11270 Overview

CVE-2026-11270 affects Google Chrome on Android in versions prior to 149.0.7827.53. The vulnerability stems from an inappropriate implementation in the browser's user interface (UI) component. A remote attacker can exploit this flaw by serving a crafted HTML page, leaking cross-origin data when a user interacts with the malicious content. Chromium engineers rated the underlying issue as Low severity, but the National Vulnerability Database (NVD) assigned it a medium rating due to its impact on data confidentiality. The weakness is tracked under [CWE-352] (Cross-Site Request Forgery), reflecting the cross-origin nature of the data exposure.

Critical Impact
Remote attackers can leak cross-origin data from Chrome on Android by luring users to a crafted HTML page, bypassing same-origin protections enforced by the browser UI.

Affected Products

Google Chrome on Android versions prior to 149.0.7827.53
Google Android (any version running a vulnerable Chrome build)
Chromium-based mobile browsers sharing the affected UI implementation

Discovery Timeline

2026-06-05 - CVE-2026-11270 published to the National Vulnerability Database (NVD)
2026-06-08 - Last updated in NVD database

Technical Details for CVE-2026-11270

Vulnerability Analysis

The vulnerability resides in the Chrome on Android UI implementation. The defect allows a crafted HTML page to interact with browser UI surfaces in a way that exposes cross-origin information. Because the issue lives in the rendering and UI layer rather than in low-level memory handling, exploitation does not require memory corruption or sandbox escape. The attacker only needs the victim to load a malicious page, which qualifies as user interaction in the CVSS vector. Successful exploitation breaks the same-origin policy, the foundational web security boundary that prevents one origin from reading data belonging to another. Leaked data may include response content, response metadata, or state information from authenticated sessions on third-party sites.

Root Cause

The root cause is an inappropriate implementation in the Chrome for Android UI code path. The implementation fails to enforce origin boundaries consistently when handling certain HTML constructs, classified under [CWE-352]. This category covers situations where the browser performs actions or exposes data without adequate verification that the requesting origin is authorized.

Attack Vector

Exploitation is network-based and requires user interaction. The attacker hosts a crafted HTML page and convinces the victim to visit it through phishing links, malicious advertisements, or compromised legitimate sites. Once the page renders in a vulnerable Chrome on Android instance, it triggers the UI behavior that leaks cross-origin data. No authentication is required on the attacker side, and the victim does not need elevated privileges. Refer to the Chromium Issue Tracker Entry for additional technical context.

Detection Methods for CVE-2026-11270

Indicators of Compromise

Outbound HTTP/HTTPS requests from Android Chrome to attacker-controlled domains immediately after visiting unfamiliar links
Unexpected POST or GET requests containing fragments of authenticated session data to non-corporate origins
Browser telemetry showing Chrome versions earlier than 149.0.7827.53 on managed Android devices

Detection Strategies

Inventory Chrome versions across the mobile fleet using mobile device management (MDM) reports and flag builds prior to 149.0.7827.53
Monitor web proxy and DNS logs for connections to newly registered domains that serve HTML payloads to Android user agents
Correlate user-reported phishing emails with subsequent Chrome activity on the same device

Monitoring Recommendations

Enable enterprise reporting in Chrome Browser Cloud Management to receive version and policy compliance data
Forward mobile browser telemetry into a centralized data lake for cross-origin request anomaly analysis
Track Google's Chrome Releases blog for follow-on advisories tied to the same release

How to Mitigate CVE-2026-11270

Immediate Actions Required

Update Google Chrome on all Android devices to version 149.0.7827.53 or later through the Google Play Store
Enforce minimum Chrome version policies via MDM to block non-compliant devices from accessing sensitive corporate resources
Communicate phishing awareness guidance to mobile users, emphasizing risks of opening untrusted links on Android

Patch Information

Google addressed CVE-2026-11270 in Chrome 149.0.7827.53 for Android. Details are available in the Google Chrome Stable Update announcement. Apply the update through Google Play, or push it via managed Google Play and enterprise mobility management tooling.

Workarounds

Restrict use of Chrome on Android for accessing high-value web applications until the patch is deployed
Route mobile browser traffic through a secure web gateway that blocks newly observed domains and inspects HTML payloads
Enable Google Safe Browsing Enhanced Protection on Android Chrome to increase warning coverage for crafted pages

bash

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

# Expected output should show 149.0.7827.53 or later
# versionName=149.0.7827.53