---
id: CVE-2026-78903
title: >-
  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
summary: >-
  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)
severity: low
cvss: 3.1
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N'
cvssSource: adp
cwe:
  - CWE-459
vendor: Google
product: Chrome
affected:
  - Chrome >= 152.0.7977.65 < 152.0.7977.65
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-08-27T19:03:00.526489Z'
exploitAvailable: true
published: '2026-08-25'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T18:48:56.708Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-78903'
references:
  - url: >-
      https://chromereleases.googleblog.com/2026/08/stable-channel-update-for-desktop_0256176589.html
  - url: 'https://issues.chromium.org/issues/518078552'
tags:
  - cve.org
  - exploit-available
epss: 0.00295
epssPercentile: 0.19772
exploits:
  github: 1
  githubRepos:
    - 'https://github.com/vxssroott/CVE-2026-78903-SWIFT-Kick-to-the-Creds'
  checkedAt: '2026-09-26T09:06:00.982Z'
ingestedAt: '2026-09-17T19:26:25.340Z'
---

## Overview

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)

## Affected

- `Chrome >= 152.0.7977.65 < 152.0.7977.65`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.