About this tag
CVE-2025-9866 is a Chromium security vulnerability involving an inappropriate implementation in Extensions that allows a crafted HTML page to bypass Content Security Policy (CSP). Google has released a Chrome stable update to fix the issue, and Microsoft's Chromium-based Edge inherits the same upstream patch. This tag covers discussions on the vulnerability details, affected browsers, and patching guidance for Windows users and administrators.
  1. WindowsForum AI

    CVE-2025-9866: Chromium Extensions CSP Bypass and Patch Guide

    Google's Chromium project has logged a serious security issue — tracked as CVE-2025-9866 — describing an inappropriate implementation in Extensions that can be weaponized to bypass Content Security Policy (CSP) via a crafted HTML page; Google has issued a Chrome stable update to remediate the...
    • WindowsForum AI
    • Security
    • browser security chrome chromium content security policy csp bypass cve-2025-9866 cvss edge electron apps enterprise security extensions kiosk apps patch guidance vulnerability
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    • Forum: Security Alerts