CVE-2026-106209 in Chrome
Summary
by MITRE • 10/06/2026
UI misrepresentation in Mobile in Google Chrome on on iOS prior to 155.0.8059.39 allowed a remote attacker leveraging social engineering to spoof address bar 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 UI misrepresentation in the mobile version of Google Chrome on iOS prior to version 155.0.8059.39 represents a significant trust boundary violation within the browser's user interface layer. This flaw specifically affects how the address bar and navigation elements are rendered when displaying web content, creating an opportunity for visual spoofing attacks. The core technical issue lies in the rendering engine's failure to properly isolate or visually distinguish between the actual URL of the loaded page and potentially misleading text injected by malicious HTML pages. By leveraging crafted HTML that exploits specific CSS properties or JavaScript DOM manipulation techniques, an attacker can overlay deceptive elements over the legitimate address bar area. This allows the creation of a fake interface state where the displayed URL appears to be from a trusted source, such as a banking institution or popular social media platform, while the underlying navigation context is entirely different and controlled by the attacker.
From a technical perspective, this vulnerability falls under the category of UI Redressing attacks, which are formally classified in the Common Weakness Enumeration (CWE) database as CWE-1021: Improper Restriction of Rendered UI Layers or Zones. The attack vector relies heavily on social engineering rather than direct code execution vulnerabilities like buffer overflows or remote code execution flaws. An attacker constructs a malicious webpage designed to mimic the visual appearance of a legitimate site by manipulating z-index layers, opacity settings, and positioning elements to cover the true address bar information. When a user interacts with this spoofed interface under iOS Chrome, they are presented with false security indicators that suggest they are safely browsing on a trusted domain. This misrepresentation breaks the fundamental trust model users place in browser UI elements, which serve as the primary visual cue for verifying site identity and authenticity during web interactions.
The operational impact of this vulnerability is primarily centered around credential theft and phishing success rates. Because modern browsers rely heavily on user vigilance to detect malicious sites through address bar inspection, undermining this mechanism significantly lowers the barrier for successful social engineering attacks. Users who are tricked into believing they are on a legitimate login page may willingly submit sensitive credentials, two-factor authentication codes, or personal identifiable information to an attacker-controlled server. Furthermore, this type of attack can be used to facilitate drive-by downloads by convincing users that a malicious file download is coming from a safe and verified source. The severity is rated as Medium because while it does not allow direct system compromise or arbitrary code execution, its effectiveness in deceiving end-users makes it a potent tool for large-scale phishing campaigns targeting mobile device users who often have less security awareness than desktop counterparts.
Mitigation strategies for this vulnerability involve both immediate software updates and long-term architectural improvements within the browser engine. The primary remediation is to upgrade Google Chrome on iOS to version 155.0.8059.39 or later, where these rendering inconsistencies have been addressed by enforcing stricter separation between UI chrome and web content layers. For organizations deploying mobile devices, ensuring that endpoint management policies enforce automatic browser updates can mitigate exposure to such risks. Additionally, users should be educated on security hygiene practices that do not rely solely on visual cues from the address bar. This includes verifying site certificates through additional means, checking for HTTPS indicators beyond just the URL text, and being skeptical of pages that request excessive permissions or exhibit unusual behavior despite appearing legitimate. From a development standpoint, browser vendors must continue to implement robust anti-phishing measures such as enhanced UI isolation techniques and automated detection systems that identify patterns consistent with UI redressing attacks, aligning with MITRE ATT&CK tactics related to Initial Access via Phishing for Credential Harvesting.