CVE-2026-87433: Race Condition

Q: What must an attacker achieve before this issue can be exploited?

The attacker must first compromise the Chrome renderer process. Exploitation then uses a crafted HTML page to bypass site isolation.

Q: Which Chrome versions are affected?

Google Chrome versions prior to 153.0.8010.36 are affected.

Q: What security boundary can exploitation bypass?

Successful exploitation can bypass Chrome site isolation after the renderer process has been compromised.

Published Sep 9, 2026

Updated

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)

Affected Software

1 affected component

Google Google Chrome<153.0.8010.36

Event History

Sep 9, 2026

CVE Published

via MITRE·12:09 AM

Data Sourced

via MITRE·12:09 AM

DescriptionWeakness

Frequently Asked Questions

What must an attacker achieve before this issue can be exploited?

The attacker must first compromise the Chrome renderer process. Exploitation then uses a crafted HTML page to bypass site isolation.

Which Chrome versions are affected?

Google Chrome versions prior to 153.0.8010.36 are affected.

What security boundary can exploitation bypass?

Successful exploitation can bypass Chrome site isolation after the renderer process has been compromised.