CVE-2026-87553

Renderer Process Escalation via Improper SiteIsolation Input Validation in Chrome

Published Sep 9, 2026 CVSS 3.1 · 8.3 High EPSS < 1% KEV · Not listed
Description
Improper input validation in SiteIsolation in Google Chrome prior to 153.0.8010.36 allowed a remote attacker who had compromised the renderer process to potentially execute arbitrary code outside the sandbox via a crafted HTML page. (Chromium security severity: Medium)

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Debian DLA Debian DLA DLA-4790-1 chromium security update
Debian DSA Debian DSA DSA-6506-1 chromium security update
History
Type Values Removed Values Added
First Time appeared Google
Google chrome
CPEs cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:*
Vendors & Products Google
Google chrome
Type Values Removed Values Added
Title Renderer Process Escalation via Improper SiteIsolation Input Validation in Chrome
Type Values Removed Values Added
Metrics cvssV3_1

{'score': 8.3, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description Improper input validation in SiteIsolation in Google Chrome prior to 153.0.8010.36 allowed a remote attacker who had compromised the renderer process to potentially execute arbitrary code outside the sandbox via a crafted HTML page. (Chromium security severity: Medium)
Weaknesses CWE-20
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
Chrome
Published
Updated
Sep 10, 2026, 3:56 AM
Reserved
Sep 8, 2026, 10:40 PM
Status
Analyzed
Published
Sep 9, 2026, 1:17 AM
Modified
Sep 10, 2026, 4:18 AM