CVE-2026-11048 is a medium severity vulnerability in Google Chrome's extension system affecting versions before 149.0.7827.53. The vulnerability arises from an inappropriate implementation that enables a malicious Chrome extension, once installed by a user, to bypass the same origin policy. This could allow the extension to perform unauthorized actions that violate web security boundaries. The CVSS 3.1 base score is 6.5 with vector AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N, indicating network attack vector, low attack complexity, no privileges required, user interaction needed, unchanged scope, no confidentiality impact, high integrity impact, and no availability impact. No known exploits in the wild have been reported. Google has published an advisory but has not explicitly stated the remediation level or patch availability in the provided data.

The vulnerability allows a malicious extension to bypass the same origin policy, potentially enabling unauthorized modification of data or actions within the browser context. This compromises the integrity of web content and user interactions but does not affect confidentiality or availability. Exploitation requires user consent to install the malicious extension, limiting the attack vector to social engineering.

Patch status is not yet confirmed — check the vendor advisory at https://chromereleases.googleblog.com/2026/06/stable-channel-update-for-desktop.html for current remediation guidance. Users and administrators should ensure Chrome is updated to version 149.0.7827.53 or later once available. Until then, avoid installing untrusted extensions and educate users about the risks of installing extensions from unknown sources.