CVE-2026-106344 in Chrome
Summary
by MITRE • 10/07/2026
Missing authorization in Permissions in Google Chrome prior to 155.0.8059.39 allowed a remote attacker who had compromised the renderer process and leveraged social engineering to bypass system access restrictions via a crafted HTML page. (Chromium security severity: Low)
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Analysis
by VulDB Data Team • 10/07/2026
The vulnerability identified in Google Chrome prior to version 155.0.8059.39 represents a critical failure in the enforcement of authorization controls within the browser's permission management system. This flaw specifically affects how the browser handles access requests for sensitive system resources, such as camera or microphone access, when initiated from web content. The core technical issue lies in the insufficient validation of the origin and context of these permission requests, allowing a malicious actor to manipulate the flow of authorization decisions. When an attacker successfully compromises the renderer process through other means, they gain the ability to execute arbitrary JavaScript within that isolated environment. By leveraging social engineering techniques, such as crafting deceptive user interfaces or prompts on a specially constructed HTML page, the attacker can trick the user into granting permissions that should otherwise be restricted or denied by default policies. This bypass of system access restrictions effectively undermines the browser's security model, which relies heavily on strict separation between untrusted web content and privileged host systems.
From an operational perspective, this vulnerability enables a remote attack scenario where the initial entry point is often phishing or drive-by downloads that lead to renderer process compromise. Once inside the renderer, the attacker exploits the missing authorization check to escalate privileges within the browser's context. This can lead to unauthorized access to sensitive user data, surveillance capabilities through camera and microphone activation without explicit consent, or further lateral movement if additional vulnerabilities are present in connected services. The severity is classified as low by Chromium security standards because it requires a pre-existing compromise of the renderer process and significant social engineering effort from the attacker. However, the impact remains substantial for end-users who may not realize their privacy has been violated until after damage occurs. This type of flaw highlights the ongoing challenge browsers face in balancing user convenience with robust security boundaries, particularly when dealing with dynamic permission grants that are subject to manipulation via crafted web pages.
In terms of industry standards and threat modeling, this vulnerability aligns closely with CWE-269, which describes Improper Authorization, where a system fails to ensure that users have the appropriate permissions for their actions. It also relates to CWE-749, Exposed Dangerous Method or Function, as it involves exposing sensitive functionality to untrusted inputs without proper checks. Within the MITRE ATT&CK framework, this behavior corresponds to techniques involving social engineering and potentially privilege escalation within a confined environment. The attack path typically follows patterns seen in T1059 Command and Scripting Interpreter for executing malicious scripts and T1204 User Execution for leveraging user interaction. Understanding these mappings helps security teams identify similar weaknesses in other applications that rely on web technologies or browser engines, emphasizing the need for rigorous input validation and strict enforcement of least-privilege principles across all permission-based APIs.
To mitigate this risk, users are strongly advised to update Google Chrome immediately to version 155.0.8059.39 or later, where these authorization checks have been hardened. Administrators should enforce automatic updates through group policies to ensure timely patching across organizational devices. Additionally, implementing browser security extensions that monitor permission requests and provide enhanced visibility into what data is being accessed can help detect anomalous behavior indicative of such exploits. Security awareness training remains crucial for educating users about the risks of interacting with untrusted web content, particularly when prompted to grant sensitive permissions. By combining technical updates with user education and monitoring tools, organizations can significantly reduce the attack surface associated with browser-based permission vulnerabilities and maintain a stronger security posture against sophisticated social engineering attacks.