CVE-2026-106187 in Chrome
Summary
by MITRE • 10/06/2026
Missing authorization in Permissions in Google Chrome prior to 155.0.8059.39 allowed a remote attacker who had compromised the renderer process to spoof UI elements via a crafted HTML page. (Chromium security severity: Low)
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 10/06/2026
The vulnerability identified as missing authorization within the permissions system of Google Chrome prior to version 155.0.8059.39 represents a significant breach in the browser's process isolation model, specifically affecting the boundary between renderer processes and the user interface layer. This flaw allows an attacker who has already achieved code execution within a compromised renderer process to manipulate the presentation of web content by spoofing critical UI elements. The severity is classified as low by Chromium security standards because it requires prior compromise of a sandboxed renderer process, which typically limits the scope of initial exploitation; however, the ability to deceive users through interface manipulation remains a serious concern for trust and integrity in web interactions.
From a technical perspective, this vulnerability stems from an insufficient check on authorization when rendering or updating specific user interface components that are shared across different contexts within the browser architecture. In modern browsers like Chrome, renderer processes operate under strict sandboxing to prevent access to sensitive system resources. However, certain UI elements such as address bars, permission prompts, or navigation indicators may be rendered in a more privileged context or communicated via inter-process communication channels where authorization checks were not rigorously enforced for all possible attack vectors. An attacker leveraging this flaw can inject crafted HTML and JavaScript into the compromised renderer to send commands that alter these shared UI states without proper verification of whether the request originates from a legitimate, authorized source within the browser's internal logic.
The operational impact of this vulnerability centers on user deception and potential phishing attacks. By spoofing UI elements, an attacker can create fake login dialogs, misleading security warnings, or altered address bar displays that mimic trusted sites or secure connections. This undermines the fundamental trust model of web browsing, where users rely on visual cues to verify the authenticity of a website and the safety of their data entry. For instance, an attacker could display a counterfeit certificate warning or hide the true URL in favor of a malicious domain name, leading users to inadvertently disclose credentials or sensitive information to phishing sites that appear legitimate due to the manipulated interface.
This type of flaw aligns with CWE-269, which describes Improper Authorization, as it involves failing to enforce proper access controls for UI manipulation functions. Furthermore, from an offensive security perspective such as the MITRE ATT&CK framework, this vulnerability facilitates techniques related to Defense Evasion and Credential Access through User Interface Redressing. The attacker uses the compromised renderer not to directly steal data but to manipulate the user's perception of reality within the browser environment, thereby bypassing human-based verification mechanisms that are often more robust than technical controls in phishing scenarios.
Mitigation for this vulnerability primarily involves upgrading Google Chrome to version 155.0.8059.39 or later, where these authorization checks have been strengthened to ensure that only authorized processes can modify critical UI elements. Organizations should enforce automated update policies to ensure all endpoints are running the latest stable release of Chromium-based browsers. Additionally, security awareness training remains crucial for end-users to recognize subtle discrepancies in interface design even when technical controls are in place, as social engineering attacks often exploit human psychology rather than pure software defects. Monitoring browser logs for unusual inter-process communication patterns can also aid in detecting attempts to leverage such vulnerabilities before they result in successful exploitation.