CVE-2026-87606

Analyzed Analyzed - Analysis Complete

Missing Authorization in SiteIsolation in Google Chrome

Publication date: 2026-09-09

Last updated on: 2026-09-11

Assigner: Chrome

Description

Missing authorization in SiteIsolation 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 HTML page. (Chromium security severity: Medium)

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-09-09

Last Modified

2026-09-11

Generated

2026-09-29

AI Q&A

2026-09-10

EPSS Evaluated

2026-09-27

NVD

CVE-2026-87606

EUVD

EUVD-2026-74309

Affected Vendors & Products

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

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 SiteIsolation in Google Chrome before version 153.0.8010.36. It allowed a remote attacker who had already compromised the renderer process to bypass site isolation protections by using a specially crafted HTML page.

Detection Guidance

Detection of this vulnerability requires checking the version of Google Chrome installed. If your version is prior to 153.0.8010.36, the system is vulnerable. Use commands like 'google-chrome --version' or check via package manager (e.g., 'apt list --installed | grep chrome' for Debian-based systems).

Impact Analysis

If exploited, this vulnerability could allow an attacker to bypass Chrome's site isolation, potentially accessing data from other websites you are logged into. This could lead to unauthorized access to sensitive information like cookies, session tokens, or personal data.

Compliance Impact

This vulnerability could potentially impact compliance with GDPR and HIPAA by allowing unauthorized access to sensitive data through bypassed site isolation in Chrome. Missing authorization in SiteIsolation may lead to data breaches, violating confidentiality requirements under these regulations.

Mitigation Strategies

Update Google Chrome to version 153.0.8010.36 or later immediately. Disable automatic updates temporarily if needed, but prioritize patching. Avoid untrusted HTML pages until updated.

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