CVE-2026-121121 in Chrome
Summary
by MITRE • 11/03/2026
UI misrepresentation in PageInfo in Google Chrome prior to 157.0.8103.38 allowed a remote attacker to spoof UI elements via a crafted HTML page. (Chromium security severity: Low)
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Analysis
by VulDB Data Team • 11/04/2026
The vulnerability identified as a user interface misrepresentation within the PageInfo component of Google Chrome, specifically in versions prior to 157.0.8103.38, represents a classic case of UI redressing or clickjacking-like behavior where visual elements are manipulated to deceive users. This flaw allows a remote attacker to spoof critical security indicators and interface components through the delivery of a specially crafted HTML page. The core technical issue lies in how the browser renders information regarding site identity and connection status, potentially allowing malicious content to overlay or mimic legitimate UI elements such as lock icons, domain names, or certificate details. By exploiting this discrepancy between what is displayed on screen and the actual underlying state of the secure context, an attacker can create a false sense of security for the end-user.
From a technical perspective, this vulnerability falls under the category of user interface manipulation attacks where the distinction between trusted browser chrome and untrusted web content becomes blurred or misinterpreted by the user. The Chromium project has classified this issue with a low severity rating, indicating that while the mechanism is present and exploitable in theory, practical exploitation may require specific conditions such as social engineering to compel users into interacting with the spoofed elements. The attack vector typically involves hosting malicious HTML content on an attacker-controlled server or injecting it via cross-site scripting if other vulnerabilities are present, though this specific flaw primarily targets the visual presentation layer rather than executing arbitrary code directly through the UI component itself.
The operational impact of this vulnerability centers on trust erosion and potential credential theft or phishing success. If a user is presented with a spoofed PageInfo that mimics a legitimate secure connection when none exists, they may inadvertently disclose sensitive information such as passwords, credit card numbers, or personal identification data to an attacker's server under the false assumption that the communication channel is encrypted and authenticated by a trusted authority. This undermines the fundamental security model of web browsing which relies on users correctly interpreting visual cues about site authenticity. Although the severity is rated low because it does not allow for direct code execution or sandbox escape, its utility in sophisticated phishing campaigns makes it a significant concern for user safety and data integrity.
Mitigation strategies primarily involve updating to Google Chrome version 157.0.8103.38 or later where these rendering inconsistencies have been addressed by the Chromium development team. For organizations managing large fleets of browsers, enforcing automatic update policies is critical to ensure that all endpoints receive patches for UI-level vulnerabilities promptly. Additionally, users should be educated on verifying URL details manually rather than relying solely on visual indicators which can be spoofed in certain edge cases. Security monitoring tools and web application firewalls may also help detect attempts to serve malicious HTML pages designed to exploit such rendering flaws by analyzing traffic patterns associated with known phishing infrastructure or suspicious DOM manipulation techniques.
In terms of industry standards, this vulnerability aligns with CWE-1021 Improper Restriction of Rendered UI Layers or Frames and relates to the ATT&CK technique T1568 Dynamic Resolution which involves domain fronting or other methods to mask malicious intent behind legitimate-looking interfaces. It also touches upon principles outlined in OWASP guidelines regarding phishing prevention through visual deception. The resolution emphasizes the importance of maintaining strict separation between browser chrome and web content, ensuring that security indicators are rendered in a way that cannot be easily overridden by page-level CSS or JavaScript tricks. Continuous vigilance and timely patching remain the most effective defenses against such low-severity but high-impact social engineering enablers.