CVE-2026-12457
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Inappropriate Implementation in Google Chrome Extensions Allows Site Isolation Bypass

Publication date: 2026-06-17

Last updated on: 2026-06-17

Assigner: Chrome

Description
Inappropriate implementation in Extensions in Google Chrome prior to 149.0.7827.155 allowed a remote attacker who had compromised the renderer process to bypass site isolation via a crafted HTML page. (Chromium security severity: High)
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Meta Information
Published
2026-06-17
Last Modified
2026-06-17
Generated
2026-06-17
AI Q&A
2026-06-17
EPSS Evaluated
N/A
NVD
CVE-2026-12457
EUVD
EUVD-2026-37542
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
google chrome to 149.0.7827.155 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-693 The product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product.
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Executive Summary

This vulnerability exists in the Extensions component of Google Chrome versions prior to 149.0.7827.155. It allows a remote attacker who has already compromised the renderer process to bypass site isolation by using a specially crafted HTML page.

Impact Analysis

An attacker exploiting this vulnerability could bypass site isolation, potentially allowing them to access or manipulate data from other sites or browser contexts that should be isolated. This could lead to leakage of sensitive information or unauthorized actions within the browser.

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