CVE-2026-121107

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Incorrect Authorization in BackgroundFetch in Google Chrome

Publication date: 2026-11-03

Last updated on: 2026-11-03

Assigner: Chrome

Description

Incorrect authorization in BackgroundFetch in Google Chrome prior to 157.0.8103.38 allowed a remote attacker to bypass web origin policy via a crafted HTML page. (Chromium security severity: High)

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-11-03

Last Modified

2026-11-03

Generated

2026-11-04

AI Q&A

2026-11-04

EPSS Evaluated

N/A

NVD

CVE-2026-121107

EUVD

EUVD-2026-116505

Affected Vendors & Products

Vendor	Product	Version / Range
Google	Chrome	157.0.8103.38

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-863	The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.

Attack-Flow Graph

Executive Summary

This vulnerability is an incorrect authorization issue in Google Chrome's BackgroundFetch feature. It allows a remote attacker to bypass the web origin policy by tricking a user into visiting a crafted HTML page. This means the attacker could access or interact with data or functions on a website without proper permission.

Impact Analysis

If exploited, this vulnerability could allow an attacker to access sensitive data or perform unauthorized actions on websites you visit. For example, they might steal login credentials, personal information, or manipulate content on trusted sites without your knowledge.

Mitigation Strategies

Update Google Chrome to version 157.0.8103.38 or later to address the incorrect authorization issue in BackgroundFetch.

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