CVE-2026-78954

Analyzed Analyzed - Analysis Complete

Incorrect Authorization Bypass in Google Chrome Extensions

Publication date: 2026-08-25

Last updated on: 2026-08-28

Assigner: Chrome

Description

Incorrect authorization in Extensions in Google Chrome prior to 152.0.7977.65 allowed a remote attacker who had compromised the renderer process to bypass web origin policy via a crafted HTML page. (Chromium security severity: High)

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-08-25

Last Modified

2026-08-28

Generated

2026-09-15

AI Q&A

2026-08-26

EPSS Evaluated

2026-09-13

NVD

CVE-2026-78954

Affected Vendors & Products

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

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-863	The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.

Attack-Flow Graph

Executive Summary

This vulnerability is an incorrect authorization issue in Google Chrome's Extensions feature. It allowed a remote attacker who had already compromised the renderer process to bypass the web origin policy by using a specially crafted HTML page. This means the attacker could access or manipulate data across different websites despite normal security restrictions.

Detection Guidance

This vulnerability is specific to Google Chrome versions prior to 152.0.7977.65. To detect it, check your Chrome version by running chrome://version/ in the browser address bar. If your version is below 152.0.7977.65, the system is vulnerable. Update Chrome to the latest version to mitigate the risk.

Impact Analysis

If you use Google Chrome, this vulnerability could allow an attacker who has already gained control of a renderer process to bypass security boundaries. This might lead to unauthorized access to sensitive data on other websites, potential data theft, or further exploitation of your system through malicious extensions or web pages.

Compliance Impact

This vulnerability allows a remote attacker to bypass web origin policy, which could lead to unauthorized access to sensitive user data. This may impact compliance with GDPR (data protection) and HIPAA (health data privacy) by enabling unauthorized data exposure or processing.

Mitigation Strategies

Update Google Chrome to version 152.0.7977.65 or later to address the incorrect authorization issue in Extensions.

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