CVE-2026-19153 is a vulnerability in Google Chrome's Workers component affecting versions before 151.0.7922.109. It arises from insufficient validation of untrusted input, enabling a remote attacker with renderer process access to bypass site isolation protections via a crafted HTML page. This could lead to unauthorized access to data across site boundaries. The vulnerability is rated high severity with a CVSS 3.1 score of 8.1 (Network attack vector, low attack complexity, no privileges required, user interaction required, unchanged scope, high confidentiality and integrity impact, no availability impact).

Successful exploitation allows bypassing of site isolation, potentially exposing sensitive data from other sites within the browser process. This compromises confidentiality and integrity of user data. There is no indication of availability impact. No known active exploitation has been reported.

The vendor advisory link is provided but does not explicitly confirm patch availability or remediation status. Patch status is not yet confirmed — check the vendor advisory at https://chromereleases.googleblog.com/2026/08/stable-channel-update-for-desktop_01193673229.html for current remediation guidance. Users should update to Chrome version 151.0.7922.109 or later once confirmed patched. Until then, exercise caution with untrusted content and consider limiting renderer process exposure.