CVE-2026-12457

chromium-browser: chromium-browser: Insufficient data validation in Extensions

Published Jun 17, 2026 CVSS 3.1 · 4.2 Medium EPSS < 1% KEV · Not listed
Description
Inappropriate implementation in Extensions in Google Chrome prior to 149.0.7827.155 allowed a remote attacker who had compromised the renderer process to bypass site isolation via a crafted HTML page. (Chromium security severity: High)

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Debian DSA Debian DSA DSA-6351-1 chromium security update
History
Type Values Removed Values Added
Title Site Isolation Bypass via Malicious Renderer Process in Chrome Extensions chromium-browser: chromium-browser: Insufficient data validation in Extensions
Weaknesses CWE-653
References
Metrics threat_severity

None

threat_severity

Important

Type Values Removed Values Added
Title Site Isolation Bypass via Malicious Renderer Process in Chrome Extensions
Type Values Removed Values Added
Title Chrome Extension Renderer Process Exploitation Allows Site Isolation Bypass
Weaknesses CWE-284
Type Values Removed Values Added
Title Chrome Extension Renderer Process Exploitation Allows Site Isolation Bypass
Weaknesses CWE-284
CWE-693
Metrics cvssV3_1

{'score': 4.2, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N'}

ssvc

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

Type Values Removed Values Added
First Time appeared Google
Google chrome
Vendors & Products Google
Google chrome
Type Values Removed Values Added
Description Inappropriate implementation in Extensions in Google Chrome prior to 149.0.7827.155 allowed a remote attacker who had compromised the renderer process to bypass site isolation via a crafted HTML page. (Chromium security severity: High)
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
Chrome
Published
Updated
Jun 17, 2026, 1:14 PM
Reserved
Jun 16, 2026, 7:38 PM
Status
Analyzed
Published
Jun 17, 2026, 1:20 PM
Modified
Oct 26, 2026, 12:10 PM
Severity
Important
Public date
Jun 17, 2026, 1:38 AM