Insufficient Policy Enforcement in ServiceWorker in Google Chrome

Publication date: 2026-05-20

Last updated on: 2026-05-21

Assigner: Chrome

Description

Insufficient policy enforcement in ServiceWorker in Google Chrome on prior to 148.0.7778.179 allowed a remote attacker to leak cross-origin data via a crafted HTML page. (Chromium security severity: High)

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-05-20

Last Modified

2026-05-21

Generated

2026-06-30

AI Q&A

2026-05-20

EPSS Evaluated

2026-06-28

NVD

CVE-2026-9116

EUVD

EUVD-2026-31166

Affected Vendors & Products

Vendor	Product	Version / Range
google	chrome	to 148.0.7778.179 (exc)

Helpful Resources

Exploitability

CWE

KEV

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.

Attack-Flow Graph

Executive Summary

This vulnerability is due to insufficient policy enforcement in the ServiceWorker component of Google Chrome versions prior to 148.0.7778.179. It allows a remote attacker to leak cross-origin data by using a specially crafted HTML page.

Impact Analysis

The impact of this vulnerability is that an attacker can remotely leak data from other origins, potentially exposing sensitive information that should be isolated by browser security policies.

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