CVE-2026-106410 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 to spoof UI elements via a crafted HTML page. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 10/07/2026
The vulnerability identified as missing authorization within the permissions subsystem 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 or compromise within a sandboxed renderer process to escalate their privileges by manipulating UI elements. The core technical issue stems from insufficient access control checks when rendering content that interacts with privileged components of the browser shell. In modern browsers, renderer processes are heavily restricted to prevent malicious web pages from accessing sensitive user data or system resources directly. However, this vulnerability indicates a lapse in verifying whether specific actions requested by the renderer process were authorized for the current context, particularly regarding UI spoofing capabilities.
From an operational perspective, the ability to spoof UI elements poses severe risks related to social engineering and credential theft. An attacker leveraging this flaw could craft a malicious HTML page that displays fake login prompts, security warnings, or download dialogs that appear authentic but are controlled by the compromised renderer. This deception can trick users into entering sensitive information such as passwords, two-factor authentication codes, or financial details into fields that look like legitimate browser interfaces but are actually part of the attacker's payload. The medium severity rating assigned by Chromium reflects the fact that while exploitation requires prior compromise of a renderer process, the impact on user trust and data confidentiality is substantial because it undermines the perceived security boundaries of the application itself.
This vulnerability aligns with CWE-269, which describes Improper Authorization, as well as CWE-798, Use of Hard-coded Credentials if specific hardcoded values were bypassed to achieve this state, though primarily it falls under privilege escalation within a sandboxed environment. In terms of the MITRE ATT&CK framework for enterprise security, this behavior maps closely to techniques involving UI redressing or phishing via browser manipulation, where attackers use legitimate application features to deceive users. The attack vector is classified as remote because the initial entry point is typically through visiting a malicious website that exploits other vulnerabilities or uses social engineering to trigger the execution of crafted code within the renderer process.
Mitigation for this issue primarily involves updating Google Chrome to version 155.0.8059.39 or later, where these authorization checks have been strengthened to ensure that only trusted contexts can modify UI elements in ways that could confuse users. For organizations managing large deployments of browsers, enforcing automatic updates through group policy or endpoint management solutions is critical to closing this window of exposure. Additionally, security awareness training should emphasize verifying the authenticity of browser-generated dialogs and warnings, as no technical control can fully prevent a determined attacker from mimicking UI elements if they have renderer access. Users should also remain vigilant for any unexpected changes in URL bars or certificate indicators when interacting with sensitive services, although this specific flaw focuses on overlaying fake interfaces rather than altering address bar information directly.