CVE-2026-87543

Modified Modified - Updated After Analysis

Authorization Bypass in Google Chrome

Publication date: 2026-09-09

Last updated on: 2026-09-10

Assigner: Chrome

Description

Missing authorization in Core 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: Low)

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-09-09

Last Modified

2026-09-10

Generated

2026-09-30

AI Q&A

2026-09-10

EPSS Evaluated

2026-09-29

NVD

CVE-2026-87543

EUVD

EUVD-2026-74440

Affected Vendors & Products

Vendor	Product	Version / Range
google	chrome	to 153.0.8010.36 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-862	The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

Attack-Flow Graph

Executive Summary

This vulnerability is a missing authorization issue in Google Chrome's Core component. It allows a remote attacker who has already compromised the renderer process to bypass site isolation protections by using a specially crafted HTML page.

Detection Guidance

This vulnerability involves missing authorization in Google Chrome's Core component. Detection primarily relies on verifying Chrome version and checking for signs of renderer process compromise. Use chrome://version to check your Chrome version. If your version is below 153.0.8010.36, the system is vulnerable. Monitor for unusual renderer process behavior or unexpected HTML page interactions.

Impact Analysis

If exploited, this vulnerability could let an attacker access data from different sites or perform actions on your behalf without proper authorization. This might lead to unauthorized access to sensitive information or account takeovers.

Compliance Impact

This vulnerability could potentially lead to unauthorized data access, which may violate GDPR's data protection requirements or HIPAA's safeguards for protected health information. Organizations using affected Chrome versions may face compliance risks.

Mitigation Strategies

Update Google Chrome to version 153.0.8010.36 or later immediately. Enable site isolation in Chrome settings by navigating to chrome://settings/system and enabling 'Use hardware acceleration when available' and 'Continue running background apps when Google Chrome is closed'. Disable unnecessary renderer processes and monitor for suspicious activity.

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