CVE-2026-106366
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Incomplete Cleanup in Chrome CustomTabs on Android Allows Origin Policy Bypass

Publication date: 2026-10-06

Last updated on: 2026-10-06

Assigner: Chrome

Description
Incomplete cleanup in CustomTabs in Google Chrome on on Android prior to 155.0.8059.39 allowed a remote attacker to bypass web origin policy via a crafted HTML page. (Chromium security severity: High)

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Meta Information

Published
2026-10-06
Last Modified
2026-10-06
Generated
2026-10-06
AI Q&A
2026-10-06
EPSS Evaluated
N/A
NVD
CVE-2026-106366
EUVD
EUVD-2026-93800

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
Google Chrome 155.0.8059.39

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-459 The product does not properly "clean up" and remove temporary or supporting resources after they have been used.

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Executive Summary

This vulnerability is an incomplete cleanup issue in CustomTabs in Google Chrome on Android. It allows a remote attacker to bypass web origin policy by tricking a user into visiting a crafted HTML page.

Detection Guidance

This vulnerability is specific to Google Chrome on Android and involves incomplete cleanup in CustomTabs. Detection requires checking the installed Chrome version on Android devices. Use the following command on affected devices: adb shell dumpsys package com.android.chrome | grep versionName. If the version is below 155.0.8059.39, the device is vulnerable.

Impact Analysis

An attacker could exploit this to access sensitive data from different websites, potentially stealing login credentials or personal information. It may also enable phishing attacks or unauthorized actions on behalf of the user.

Compliance Impact

This vulnerability could lead to unauthorized data access, violating GDPR's data protection principles or HIPAA's safeguards for protected health information. Organizations may face compliance breaches if user data is compromised.

Mitigation Strategies

Update Google Chrome on all Android devices to version 155.0.8059.39 or later. Disable CustomTabs usage in applications if possible until the update is applied. Monitor for unusual web origin bypass attempts in network traffic.

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