CVE-2026-106333 in Chrome
Summary
by MITRE • 10/07/2026
Incorrect authorization in Input in Google Chrome prior to 155.0.8059.39 allowed a remote attacker leveraging social engineering 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 an incorrect authorization flaw within the input handling mechanisms of Google Chrome prior to version 155.0.8059.39 represents a significant breach in user interface integrity and trust boundaries. This issue stems from a failure in the browser's internal logic to properly validate or restrict how certain HTML elements interact with the surrounding page context, specifically regarding authorization checks for UI rendering operations. When a remote attacker constructs a malicious webpage containing specially crafted HTML code, they can exploit this lack of strict input validation to manipulate the visual presentation of the interface. The core technical flaw lies in the browser's inability to distinguish between legitimate user-initiated actions and those induced by deceptive scripting techniques that bypass standard security checks designed to prevent UI spoofing.
From a technical perspective, this vulnerability falls under the category of improper authorization within the input processing pipeline. It allows an attacker to inject or modify HTML structures in a way that mimics trusted browser elements such as address bars, certificate indicators, or system dialogs. By leveraging social engineering tactics, the attacker can present these spoofed UI elements to the victim in a manner that appears authentic and trustworthy. This deception is particularly dangerous because it exploits the user's reliance on visual cues for security assessment rather than verifying the actual domain context through more rigorous means. The Chromium project has classified this issue with a medium severity rating, indicating that while exploitation requires specific conditions such as user interaction or social engineering, the potential impact on confidentiality and integrity remains substantial due to the erosion of trust in the browsing interface.
The operational impact of this vulnerability is primarily centered around phishing and credential harvesting scenarios where visual deception plays a critical role. An attacker can create a webpage that displays a fake secure lock icon or a misleading URL bar while actually loading content from an untrusted source. This misleads users into believing they are interacting with a legitimate, encrypted service when they may be submitting sensitive information to a malicious server. The success of such attacks depends heavily on the victim's ability to visually distinguish between genuine and spoofed interface elements, which is often compromised by sophisticated design techniques that replicate official branding or layout patterns accurately. Consequently, users who fall for these deceptions risk unauthorized access to their accounts, exposure of personal data, or installation of malware through subsequent steps in the attack chain.
In terms of industry standards classification, this vulnerability aligns with CWE-269 which denotes Improper Authorization, as it involves a failure to enforce proper privileges during input handling that leads to unintended UI modifications. Furthermore, from an offensive security perspective such as the MITRE ATT&CK framework, this technique is relevant to T1078 Valid Accounts and potentially T1553 Subvert Trust Controls if used in conjunction with other exploits to bypass browser security features like site isolation or origin checks. The attack vector leverages social engineering which corresponds to techniques aimed at manipulating human behavior rather than purely exploiting software bugs, highlighting the importance of user education alongside technical fixes.
Mitigation strategies for this vulnerability primarily involve updating Google Chrome to version 155.0.8059.39 or later where these input authorization checks have been strengthened and UI spoofing vectors are closed. For organizations managing large fleets of browsers, implementing automated patch management systems ensures that all endpoints receive the necessary security updates promptly. Additionally, users should be educated on verifying URL details manually rather than relying solely on visual indicators like lock icons which can now be spoofed by such vulnerabilities. Enabling strict content security policies and utilizing browser extensions that provide additional verification layers for sensitive transactions can also serve as supplementary defenses against UI-based social engineering attacks until the underlying software is fully patched across all environments.