CVE-2026-11020 is a medium severity vulnerability in Google Chrome's Extensions implementation before version 149.0.7827.53. It allows a remote attacker to leak cross-origin data by leveraging crafted XML files. This vulnerability stems from improper handling of extension security policies, enabling unauthorized data exposure across origins. The CVSS 3.1 base score is 6.5, reflecting network attack vector, low attack complexity, no privileges required, user interaction required, unchanged scope, high confidentiality impact, and no integrity or availability impact. There is no explicit vendor advisory stating a patch or fix, but the affected versions are prior to 149.0.7827.53, implying that updating to 149.0.7827.53 or later addresses the issue.

Successful exploitation can lead to unauthorized disclosure of sensitive cross-origin data, compromising user privacy and potentially exposing confidential information. The vulnerability does not affect integrity or availability but has a high impact on confidentiality. No known exploits in the wild have been reported to date.

Users and administrators should update Google Chrome to version 149.0.7827.53 or later, as this version addresses the vulnerability. Since no official remediation level or patch link is explicitly provided, the vendor's stable channel update blog should be monitored for confirmation. No additional mitigation steps are specified by the vendor advisory.