CVE-2026-121174

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Missing Authorization in Google Chrome BackgroundFetch

Publication date: 2026-11-03

Last updated on: 2026-11-03

Assigner: Chrome

Description

Missing 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-2026-121174

EUVD

EUVD-2026-116508

Affected Vendors & Products

Vendor	Product	Version / Range
Google	Chrome	157.0.8103.38

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-862	The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

Attack-Flow Graph

Executive Summary

This vulnerability is a missing authorization issue in Google Chrome's BackgroundFetch feature. It allows a remote attacker to bypass web origin policy by tricking a user into visiting a crafted HTML page. This means the attacker could potentially access or manipulate data outside the intended website boundaries.

Impact Analysis

If exploited, this vulnerability could let an attacker access sensitive data from other websites you visit, perform unauthorized actions on your behalf, or intercept information. It primarily affects users who visit malicious websites or untrusted links.

Mitigation Strategies

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

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