The vulnerability CVE-2026-12025 affects Google Chrome versions before 149.0.7827.115. It arises from insufficient validation of untrusted input in the network component, enabling a remote attacker with control over the renderer process to leak cross-origin data through a specially crafted HTML page. This could lead to unauthorized data disclosure across origins. The vendor advisory link is provided but does not explicitly state the patch or remediation status. The vulnerability is marked as high severity by Chromium security.

An attacker who has already compromised the renderer process in affected Chrome versions can exploit this vulnerability to leak data across origins, potentially exposing sensitive information that should be isolated by the browser's same-origin policy. This undermines browser security boundaries and user data confidentiality.

Patch status is not yet confirmed — check the vendor advisory at https://chromereleases.googleblog.com/2026/06/stable-channel-update-for-desktop_01962725236.html for current remediation guidance. Users and administrators should monitor for official updates from Google and apply them promptly once available.