CVE-2026-106327 in Chrome
Summary
by MITRE • 10/07/2026
Incorrect authorization in Core in Google Chrome prior to 155.0.8059.39 allowed a remote attacker who had compromised the renderer process to bypass system access restrictions via a crafted HTML page. (Chromium security severity: High)
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Analysis
by VulDB Data Team • 10/07/2026
The vulnerability identified as an incorrect authorization flaw within the core components of Google Chrome, specifically affecting versions prior to 155.0.8059.39, represents a significant breach in process isolation boundaries that are fundamental to modern browser security architecture. This issue stems from a logic error where the browser fails to properly validate access controls when transitioning between different privilege levels or interacting with system-level resources. In the context of Chrome’s multi-process architecture, each tab and extension typically runs in a sandboxed renderer process designed to restrict its ability to interact directly with the host operating system or sensitive user data. The flaw allows an attacker who has already achieved code execution within this restricted renderer environment to escalate privileges by bypassing these intended restrictions through a specifically crafted HTML page.
From a technical perspective, the root cause lies in the improper enforcement of authorization checks during specific API calls or internal state transitions managed by the browser core. When a malicious webpage is loaded, it can trigger actions that request access to system resources such as file systems, network interfaces, or hardware devices. Due to the vulnerability, the security boundary between the untrusted renderer process and the more trusted browser processes does not correctly reject these unauthorized requests. This effectively neutralizes the sandboxing mechanism intended to contain potential exploits within a limited execution environment, allowing the malicious code to perform operations that should be strictly prohibited under normal circumstances.
The operational impact of this vulnerability is severe because it facilitates privilege escalation from a low-privilege context to one with broader system access capabilities. An attacker leveraging this flaw could potentially read sensitive files stored on the user’s device, modify browser settings or extensions, intercept network traffic, or execute further malicious payloads that rely on higher-level permissions. This undermines the principle of least privilege and compromises the integrity of the browsing session. The severity is classified as High by Chromium security standards due to the ease with which an attacker can exploit this via a simple web page visit, requiring no user interaction beyond loading the crafted content if other protections like click-to-play are disabled or bypassed.
This type of vulnerability aligns closely with CWE-269, Improper Privilege Management, as it involves failing to enforce proper access control policies for elevated privileges. Furthermore, in terms of offensive security frameworks such as MITRE ATT&CK, this behavior corresponds to techniques related to privilege escalation and defense evasion, specifically within the context of browser-based attacks where attackers seek to break out of sandboxed environments to achieve persistent or broader system compromise. The exploitation vector is classified as remote because it can be triggered by visiting a malicious website without requiring physical access or local account credentials on the victim’s machine.
Mitigation strategies primarily involve updating Google Chrome to version 155.0.8059.39 or later, where these authorization checks have been corrected and reinforced. Users should ensure that automatic updates are enabled to receive security patches promptly as they become available. Additionally, employing browser hardening techniques such as disabling JavaScript for untrusted sites, using strict content security policies in development environments, and utilizing extensions that enforce stricter sandboxing can provide additional layers of defense against similar exploitation attempts until the software is fully patched. Security administrators should also monitor for indicators of compromise related to renderer process anomalies or unexpected system resource access patterns that may indicate active exploitation of this flaw before updates are applied.