CVE-2026-93379 in Chrome
Summary
by MITRE • 09/18/2026
Incorrect authorization in ORB in Google Chrome prior to 153.0.8010.52 allowed a remote attacker to bypass site isolation via a crafted HTML page. (Chromium security severity: High)
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Analysis
by VulDB Data Team • 09/18/2026
The vulnerability identified as an incorrect authorization issue within the Object Request Broker component of Google Chrome, specifically affecting versions prior to 153.0.8010.52, represents a significant breach in the browser's internal access control mechanisms. This flaw stems from a logic error where the security checks governing inter-component communication were insufficiently rigorous or improperly implemented. The Object Request Broker serves as a critical infrastructure element within Chromium-based browsers, facilitating method calls and data exchange between different processes such as renderer processes, utility services, and the main browser process. When authorization controls are flawed in this layer, it allows for unauthorized interactions that bypass intended security boundaries, effectively undermining the isolation guarantees provided by the architecture.
The operational impact of this vulnerability is severe because it enables a remote attacker to circumvent site isolation protections through a specially crafted HTML page. Site isolation is a fundamental defense mechanism designed to prevent cross-site scripting attacks and data leakage between different origins by ensuring that content from one website cannot access memory or resources belonging to another. By exploiting the authorization flaw in the ORB, an attacker can trick the browser into granting elevated privileges or accessing sensitive context information across origin boundaries. This bypass allows for potential data exfiltration, session hijacking, or further exploitation of other vulnerabilities within the same browsing context, as the strict separation between sites is effectively nullified by the malformed authorization checks.
From a classification perspective, this issue aligns with CWE-269, which denotes Improper Authorization, where an actor is able to access resources for which they should not have been granted permission. Furthermore, in the context of the MITRE ATT&CK framework, this vulnerability facilitates techniques related to privilege escalation and defense evasion, specifically allowing attackers to bypass sandbox restrictions that are critical for limiting the blast radius of a compromise. The ability to break site isolation is particularly dangerous as it erodes one of the most effective modern defenses against web-based attacks, potentially leading to full system compromise if combined with other exploit chains targeting renderer process vulnerabilities.
Mitigation strategies primarily involve updating Google Chrome to version 153.0.8010.52 or later, where these authorization checks have been corrected and hardened by the Chromium security team. Organizations should ensure that endpoint protection policies enforce automatic updates for web browsers to minimize exposure windows. Additionally, users can employ browser hardening techniques such as disabling JavaScript in untrusted sites or using extensions that restrict cross-origin requests, although these are secondary measures compared to patching the underlying software defect. Continuous monitoring of browser security advisories and maintaining strict update cycles remain essential practices for defending against此类 logic-based vulnerabilities that exploit complex internal architectures rather than simple memory corruption errors.