CVE-2026-91734 is an incorrect authorization vulnerability in Google Chrome's core component on Windows platforms before version 153.0.8010.47. This flaw enables a local attacker to execute arbitrary code outside the browser's sandbox environment by exploiting improper authorization checks. The vulnerability is classified as high severity by Chromium security. The vendor has released an update to address this issue as indicated in the official Chrome stable channel update blog post.

Successful exploitation allows a local attacker to execute arbitrary code outside the sandbox, potentially leading to privilege escalation or unauthorized actions on the affected system. This compromises the security boundary intended by Chrome's sandboxing mechanism.

Users should update Google Chrome on Windows to version 153.0.8010.47 or later to remediate this vulnerability. The vendor has provided an official fix as part of the stable channel update. Applying this update eliminates the risk posed by this incorrect authorization flaw.