CVE-2026-106259 in Chrome
Summary
by MITRE • 10/06/2026
Incorrect authorization in PermissionElement in Google Chrome prior to 155.0.8059.39 allowed a remote attacker 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 as an incorrect authorization flaw within the PermissionElement component of Google Chrome represents a significant deviation from expected privilege management protocols. This issue stems from improper checks performed when handling permission requests, specifically those related to system access restrictions such as camera, microphone, or location services. In a properly secured browser environment, any request for sensitive user data must undergo rigorous validation against current policy settings and user consent states before granting access. However, in versions of Chrome prior to 155.0.8059.39, the logic governing these permission grants failed to correctly enforce restrictions under certain conditions. This failure allows a remote attacker who controls or influences an HTML page loaded within the browser context to bypass these system-level safeguards. The core technical flaw lies in the PermissionElement's inability to consistently verify whether the requesting origin has been explicitly granted or denied access, leading to scenarios where unauthorized origins can successfully invoke APIs that should remain blocked.
From a security architecture perspective, this vulnerability aligns with CWE-269, which describes Improper Privilege Assignment, and more specifically relates to CWE-749, Exposed Dangerous Method in an Object-Oriented Context. The attacker leverages standard web technologies such as JavaScript and HTML5 APIs to trigger the permission request flow. By crafting a malicious webpage that exploits the race conditions or state management errors within the PermissionElement, the adversary can trick the browser into believing that valid authorization has been established when it has not. This bypass is particularly dangerous because it operates at the intersection of web content execution and operating system resource access. Once the permission is erroneously granted, the malicious script gains direct programmatic access to hardware resources or sensitive user data streams without explicit user interaction or confirmation dialogs appearing as expected.
The operational impact of this vulnerability is substantial for end-users who rely on Chrome for secure browsing activities involving private information. An attacker can use this flaw to conduct surveillance by accessing webcams and microphones remotely, effectively turning the victim's device into a spy tool without their knowledge. Furthermore, it enables precise location tracking through unauthorized access to geolocation services, compromising user privacy and potentially enabling physical stalking or targeted attacks based on geographic data. In enterprise environments where Chrome is deployed with strict security policies restricting certain permissions for specific domains, this flaw undermines those controls, allowing malicious scripts from untrusted sources to operate as if they were trusted entities. This erosion of trust in the browser's permission model can lead to broader security compromises, including credential theft via keylogging through microphone access or phishing attacks enhanced by realistic camera feeds that appear legitimate due to unauthorized real-time video capture capabilities.
Mitigation strategies primarily involve immediate software updates to address the root cause within the Chromium codebase. Users and administrators must upgrade Google Chrome to version 155.0.8059.39 or later, where these permission checks have been hardened to ensure that authorization states are correctly validated before any API access is granted. In addition to patching, organizations should enforce strict Content Security Policies (CSP) to limit the sources from which scripts can execute and restrict permissions via enterprise policy configurations. For example, administrators can disable specific APIs like camera or microphone for all users except those who explicitly require them, thereby reducing the attack surface even if a browser vulnerability exists. Monitoring network traffic for unusual patterns of API calls originating from web pages can also help in detecting potential exploitation attempts in real-time. Security awareness training remains critical to ensure that users do not inadvertently load untrusted content into privileged browsing contexts where such vulnerabilities might be leveraged against them.