CVE-2026-78949: Observable discrepancy in CustomTabs

Published May 29, 2026
·
Updated

Observable discrepancy in CustomTabs in Google Chrome on on Android prior to 152.0.7977.65 allowed a local attacker to obtain cross-origin data via a co-installed app. (Chromium security severity: Medium)

Credit

Google

Affected Software

2 affected componentsFixes available
Google Google Chrome<152.0.7977.65
Google Chrome<152.0.7977.64
152.0.7977.64

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 152.0.7977.64
  2. Upgrade

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

    Fixed in 152.0.7977.65

Event History

May 29, 2026
CVE Published
12:00 AM
Data Sourced
12:00 AM
SeverityWeaknessAffected Software
Aug 25, 2026
CVE Published
via MITRE·08:10 PM
Data Sourced
via MITRE·08:10 PM
DescriptionWeakness
Data Sourced
via NVD·09:17 PM
DescriptionWeakness

Parent advisories

This vulnerability appears in the following advisories.

Peer vulnerabilities

Found alongside the following vulnerabilities.

Frequently Asked Questions

1

Who is exposed to this issue?

Android devices running Google Chrome earlier than 152.0.7977.65 are affected. Exploitation requires a co-installed application, so the attacker must already be able to place or persuade the user to install an app on the device.

2

What access does an attacker need, and what could they obtain?

The attacker needs local access through a co-installed app that can interact with Chrome CustomTabs. The issue could allow that app to obtain cross-origin data.

3

How can I remediate the issue?

Update Google Chrome on Android to version 152.0.7977.65 or later.

Company

Resources

Contact

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