---
id: CVE-2026-78953
title: >-
  Missing authorization 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 PDF file
summary: >-
  Missing authorization 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 PDF file. (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'
cwe:
  - CWE-862
vendor: google
product: chrome
affected:
  - chrome < 152.0.7977.65
patched:
  - chrome 152.0.7977.65
published: '2026-08-25'
updated: '2026-09-19'
sourceUpdated: '2026-09-19T14:16:59.297'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-78953'
references:
  - url: >-
      https://chromereleases.googleblog.com/2026/08/stable-channel-update-for-desktop_0256176589.html
    label: chrome-cve-admin@google.com
  - url: 'https://issues.chromium.org/issues/516665605'
    label: chrome-cve-admin@google.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-08-27T19:06:19.290605Z'
epss: 0.00213
epssPercentile: 0.10484
ingestedAt: '2026-09-17T19:26:25.292Z'
---

## Overview

Missing authorization 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 PDF file. (Chromium security severity: Medium)

## Affected

- `chrome < 152.0.7977.65`

## Remediation

Upgrade past the affected range:

- `chrome 152.0.7977.65`