CVE-2026-17838 in Chrome
Summary
by MITRE • 07/30/2026
Incorrect security UI in Chrome for iOS in Google Chrome on iOS prior to 151.0.7922.72 allowed a remote attacker to perform domain spoofing via a crafted HTML page. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 07/30/2026
This vulnerability represents a critical user interface security flaw in the chromium-based google chrome browser for ios devices, where the security indicators displayed to users were not properly validated during navigation transitions. The issue stemmed from improper handling of domain verification during page load sequences, allowing malicious actors to exploit the browser's visual security cues through carefully crafted html content.
The technical nature of this vulnerability falls under the category of user interface deception and domain spoofing attacks, which directly violates fundamental security principles of web browser isolation and trust establishment. When users navigated to compromised pages, chrome failed to properly validate the origin of the content, allowing attackers to manipulate the displayed security indicators such as URL bar colors, certificate information, or other visual cues that typically inform users about the legitimacy of their connections.
The operational impact of this vulnerability extends beyond simple phishing attacks, as it fundamentally undermines user trust in the browser's security warnings. Attackers could craft malicious web pages that appear to display legitimate security indicators while actually routing users to fraudulent domains, making it particularly dangerous for financial transactions, sensitive data entry, or any interaction requiring authentication. This type of attack maps directly to attack techniques described in the mitre attack framework under credential access and defense evasion categories.
Users interacting with compromised websites would experience a false sense of security, potentially leading to successful social engineering campaigns where victims unknowingly provide credentials or personal information to malicious actors. The vulnerability's medium severity classification reflects its potential for exploitation in real-world scenarios while acknowledging that it required specific user interaction patterns and sophisticated attack crafting techniques.
The fix implemented by google involved strengthening the validation mechanisms for security indicators during page transitions, ensuring that visual cues properly reflect the actual network connection state and domain authenticity. This remediation aligns with established security practices described in common weakness enumeration standards, specifically addressing issues related to improper validation of security state information and user interface deception patterns. Organizations should ensure all chrome for ios installations are updated to version 151.0.7922.72 or later to mitigate this risk, while security teams should monitor for potential exploitation attempts in their network traffic analysis activities.
The vulnerability highlights the importance of maintaining consistent security validation across all user interface elements, particularly in mobile environments where users may have limited ability to verify connection details manually. Browser vendors must continuously test and validate their security indicators against sophisticated attack vectors, as user interface security features represent one of the primary interfaces between technology and user trust in digital environments. This incident serves as a reminder that even seemingly minor UI validation issues can create significant security risks when they enable attackers to manipulate user perception of system security state.