CVE-2026-78936

Received Received - Intake

Observable Discrepancy in CustomTabs in Google Chrome on Android

Publication date: 2026-08-25

Last updated on: 2026-08-25

Assigner: Chrome

Description

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)

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-08-25

Last Modified

2026-08-25

Generated

2026-08-26

AI Q&A

2026-08-26

EPSS Evaluated

N/A

NVD

CVE-2026-78936

Affected Vendors & Products

Vendor	Product	Version / Range
google	chrome	to 152.0.7977.65 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-203	The product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor, which exposes security-relevant information about the state of the product, such as whether a particular operation was successful or not.

Attack-Flow Graph

Executive Summary

This vulnerability involves an observable discrepancy in CustomTabs in Google Chrome on Android versions prior to 152.0.7977.65. A local attacker could exploit this by using a co-installed app to access cross-origin data, meaning data from other websites or apps they should not have access to.

Impact Analysis

If you use an affected version of Google Chrome on Android, a malicious app installed on your device could potentially access sensitive data from other websites or apps you are using through CustomTabs. This could lead to unauthorized access to personal or confidential information.

Compliance Impact

This vulnerability could lead to unauthorized data access, which may violate compliance requirements under GDPR, HIPAA, or other regulations that mandate strict protection of user data. Organizations using affected Chrome versions may face legal and regulatory penalties for failing to safeguard sensitive information.

Mitigation Strategies

Update Google Chrome on Android to version 152.0.7977.65 or later to address the vulnerability.

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