CVE-2026-13838 is a security vulnerability in Google Chrome affecting versions prior to 150.0.7871.47. It arises from an inappropriate implementation of CSS that enables a remote attacker to bypass the same origin policy by using a specially crafted HTML page. The same origin policy is a critical security mechanism that restricts how documents or scripts loaded from one origin can interact with resources from another origin. Bypassing this policy can lead to unauthorized actions or data manipulation within the browser context. The vulnerability is assigned a CVSS v3.1 base score of 6.5, indicating a medium severity level with network attack vector, low attack complexity, no privileges required, user interaction required, unchanged scope, no confidentiality impact, high integrity impact, and no availability impact. There is no explicit vendor advisory statement confirming a patch or fix, and no known exploits have been reported.

The vulnerability allows remote attackers to bypass the same origin policy in affected versions of Google Chrome, potentially enabling unauthorized manipulation of web content or scripts across origins. This impacts the integrity of web interactions but does not compromise confidentiality or availability. Since the attack requires user interaction and has low complexity, it poses a moderate risk to users running vulnerable versions.

Patch status is not yet confirmed — check the vendor advisory at https://chromereleases.googleblog.com/2026/06/stable-channel-update-for-desktop_0175352312.html for current remediation guidance. Users and administrators should monitor official Google Chrome release notes and update to version 150.0.7871.47 or later once confirmed fixed. Until then, exercising caution with untrusted web content is advisable.