CVE-2026-87499

Analyzed Analyzed - Analysis Complete

Incorrect Authorization Bypass in Google Chrome

Publication date: 2026-09-09

Last updated on: 2026-09-10

Assigner: Chrome

Description

Incorrect authorization in Network in Google Chrome prior to 153.0.8010.36 allowed a remote attacker who had compromised the renderer process to bypass site isolation via a crafted HTML page. (Chromium security severity: High)

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-09-09

Last Modified

2026-09-10

Generated

2026-09-29

AI Q&A

2026-09-10

EPSS Evaluated

2026-09-27

NVD

CVE-2026-87499

EUVD

EUVD-2026-74519

Affected Vendors & Products

Vendor	Product	Version / Range
google	chrome	to 153.0.8010.36 (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 involves incorrect authorization in Google Chrome's Network component. A remote attacker who has already compromised the renderer process could bypass site isolation by tricking a user into visiting a specially crafted HTML page. Site isolation is a security feature that separates content from different websites to prevent data leaks.

Detection Guidance

This vulnerability involves incorrect authorization in Google Chrome's Network component. Detection primarily requires checking the Chrome version installed on systems. If the version is prior to 153.0.8010.36, the system is vulnerable. Use commands like 'google-chrome --version' or 'chromium-browser --version' to check the installed version.

Impact Analysis

If you use Google Chrome prior to version 153.0.8010.36, an attacker who gains control of the renderer process (e.g., through another exploit) could use this flaw to access data from other websites you have open. This could lead to theft of sensitive information like passwords or personal data.

Compliance Impact

This vulnerability could lead to unauthorized access to personal or sensitive data, which may violate GDPR's data protection principles or HIPAA's requirements for safeguarding health information. Organizations using affected Chrome versions may face compliance risks if data breaches occur.

Mitigation Strategies

Update Google Chrome to version 153.0.8010.36 or later to address the incorrect authorization issue in the Network component.

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