CVE-2026-12456
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Extensions Bypass Same Origin Policy in Google Chrome

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 an attacker who convinced a user to install a malicious extension to bypass same origin policy via a crafted Chrome Extension. (Chromium security severity: High)

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Meta Information

Published
2026-06-17
Last Modified
2026-06-17
Generated
2026-07-08
AI Q&A
2026-06-17
EPSS Evaluated
2026-07-06
NVD
CVE-2026-12456
EUVD
EUVD-2026-37541

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
google chrome to 149.0.7827.155 (exc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-20 The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

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Executive Summary

This vulnerability is due to an inappropriate implementation in the Extensions feature of Google Chrome versions prior to 149.0.7827.155. It allows an attacker who convinces a user to install a malicious Chrome extension to bypass the same origin policy by using a specially crafted extension.

Impact Analysis

If exploited, this vulnerability can allow an attacker to bypass the same origin policy, potentially enabling them to access or manipulate data across different origins that should normally be isolated. This could lead to unauthorized access to sensitive information or interference with web application behavior.

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