CVE-2026-106366: Incomplete cleanup in CustomTabs

Published Aug 24, 2026
·
Updated

Chromium CVE-2026-106366: Incomplete cleanup in CustomTabs

Other sources

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)

— MITRE

This CVE was assigned by Chrome. Microsoft Edge (Chromium-based) ingests Chromium, which addresses this vulnerability. Please see Google Chrome Releases for more information.

— Microsoft

Credit

Naoya Miyaguchi

Affected Software

5 affected componentsFixes available
Google Chrome<155.0.8059.39
155.0.8059.39
All of the following
Google Chrome<155.0.8059.39
Google Android
Microsoft Edge (Chromium-based)<155.0.4283.48
155.0.4283.48
Microsoft Edge<155.0.4283.48
155.0.4283.48

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 155.0.8059.39
  2. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 155.0.4283.48
  3. Upgrade

    Upgrade Google Chrome on Android to a version that resolves this vulnerability.

    Fixed in 155.0.8059.39

Event History

Aug 24, 2026
CVE Published
12:00 AM
Data Sourced
12:00 AM
WeaknessAffected Software
Oct 6, 2026
CVE Published
via MITRE·06:41 PM
Data Sourced
via MITRE·06:41 PM
DescriptionWeakness
Data Sourced
via NVD·07:18 PM
DescriptionSeverityWeaknessAffected Software
Oct 27, 2026
Data Sourced
via Microsoft·06:51 AM
DescriptionSeverityWeaknessAffected Software

Parent advisories

This vulnerability appears in the following advisories.

Peer vulnerabilities

Found alongside the following vulnerabilities.

Frequently Asked Questions

1

Which deployments are affected?

Google Chrome on Android versions before 155.0.8059.39 are affected. The issue is in CustomTabs.

2

What does an attacker need to exploit this issue?

A remote attacker needs to induce the target to process a crafted HTML page. No additional prerequisites are specified in the available data.

3

What is the security impact?

Successful exploitation can bypass the web origin policy, undermining origin-based isolation between web content.

Company

Resources

Contact

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