CVE-2026-87505

Analyzed Analyzed - Analysis Complete

Incorrect Authorization in Google Chrome PDF FileSystem

Publication date: 2026-09-09

Last updated on: 2026-09-10

Assigner: Chrome

Description

Incorrect authorization in FileSystem in Google Chrome prior to 153.0.8010.36 allowed a remote attacker who had compromised the renderer process to bypass site isolation via a crafted PDF file. (Chromium security severity: Medium)

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-09-09

Last Modified

2026-09-10

Generated

2026-09-29

AI Q&A

2026-09-10

EPSS Evaluated

2026-09-27

NVD

CVE-2026-87505

EUVD

EUVD-2026-74388

Affected Vendors & Products

Vendor	Product	Version / Range
google	chrome	to 153.0.8010.36 (exc)

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 involves incorrect authorization in the FileSystem component of Google Chrome before version 153.0.8010.36. A remote attacker who had already compromised the renderer process could exploit a crafted PDF file to bypass site isolation protections.

Detection Guidance

This vulnerability involves incorrect authorization in Google Chrome's FileSystem component due to a renderer process compromise via a crafted PDF. Detection primarily relies on ensuring Chrome is updated to version 153.0.8010.36 or later. Check Chrome version via chrome://settings/help or command line: google-chrome --version. Monitor for unusual PDF rendering behavior or renderer process crashes.

Impact Analysis

If you use an affected version of Chrome, an attacker could potentially access data from other sites or perform actions on your behalf by bypassing security boundaries. This could lead to unauthorized access to sensitive information.

Compliance Impact

This vulnerability could lead to unauthorized data exposure, which may violate GDPR's data protection requirements or HIPAA's privacy rules if sensitive personal or health data is accessed. Organizations must ensure proper mitigation to maintain compliance.

Mitigation Strategies

Update Google Chrome to version 153.0.8010.36 or later to address the incorrect authorization issue in the FileSystem component.

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