CVE-2026-87433

Modified Modified - Updated After Analysis

Race Condition in Google Chrome FileAPI

Publication date: 2026-09-09

Last updated on: 2026-09-10

Assigner: Chrome

Description

Race condition in FileAPI 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: Medium)

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-09-09

Last Modified

2026-09-10

Generated

2026-09-29

AI Q&A

2026-09-09

EPSS Evaluated

2026-09-27

NVD

CVE-2026-87433

EUVD

EUVD-2026-74318

Affected Vendors & Products

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

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-367	The product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check.

Attack-Flow Graph

Executive Summary

This vulnerability is a race condition in the FileAPI component of Google Chrome before version 153.0.8010.36. A race condition occurs when a system's behavior depends on the timing of events, allowing an attacker who has already compromised the renderer process to bypass site isolation protections. This could let the attacker access data from other sites or perform unauthorized actions.

Detection Guidance

This vulnerability is specific to Google Chrome versions prior to 153.0.8010.36. To detect it, check your Chrome version by running chrome://version/ in the browser. If your version is below 153.0.8010.36, the system is vulnerable. Update Chrome to the latest version to mitigate the issue.

Impact Analysis

If you use an affected version of Chrome, an attacker who exploits this flaw could access sensitive data from other websites you visit, such as login credentials or personal information. This could lead to identity theft, financial loss, or unauthorized account access.

Compliance Impact

This vulnerability could lead to unauthorized access to personal data, violating GDPR's data protection principles and HIPAA's safeguards for protected health information. Organizations using affected Chrome versions may face compliance breaches, legal penalties, and reputational damage.

Mitigation Strategies

Update Google Chrome to version 153.0.8010.36 or later to address the race condition in FileAPI.

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