CVE-2026-78903

Received Received - Intake

Incomplete Cleanup in SiteIsolation in Google Chrome

Publication date: 2026-08-25

Last updated on: 2026-08-25

Assigner: Chrome

Description

Incomplete cleanup in SiteIsolation in Google Chrome prior to 152.0.7977.65 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:
Percentile:

Meta Information

Published

2026-08-25

Last Modified

2026-08-25

Generated

2026-08-26

AI Q&A

2026-08-26

EPSS Evaluated

N/A

NVD

CVE-2026-78903

Affected Vendors & Products

Vendor	Product	Version / Range
google	chrome	to 152.0.7977.65 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-459	The product does not properly "clean up" and remove temporary or supporting resources after they have been used.

Attack-Flow Graph

Executive Summary

This vulnerability involves incomplete cleanup in SiteIsolation in Google Chrome before version 152.0.7977.65. A remote attacker who already compromised the renderer process could exploit this to bypass site isolation by using a specially crafted HTML page.

Impact Analysis

If you use an affected version of Chrome, an attacker who gains control of the renderer process could access data from other sites you visit, potentially stealing sensitive information like passwords or personal data.

Compliance Impact

This vulnerability could lead to unauthorized data access, violating GDPR's data protection principles or HIPAA's requirements for safeguarding protected health information. Organizations may face compliance penalties if user data is exposed due to this issue.

Mitigation Strategies

Update Google Chrome to version 152.0.7977.65 or later to address the vulnerability.

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