CVE-2026-18009
Summary
by MITRE • 07/30/2026
Insufficient validation of untrusted input in Passwords in Google Chrome prior to 151.0.7922.72 allowed a remote attacker to perform UI spoofing via malicious network traffic. (Chromium security severity: Low)
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Analysis
by VulDB Data Team • 07/30/2026
This vulnerability represents a classic case of insufficient input validation that enables user interface spoofing attacks within the Google Chrome browser. The flaw existed in versions prior to 151.0.7922.72 and specifically affected how the browser handled untrusted password input data. The vulnerability stems from inadequate sanitization and validation mechanisms that should have prevented malicious network traffic from being processed in a way that could manipulate the browser's user interface elements. According to chromium security severity classification, this issue was rated as low severity, but its implications for user trust and potential exploitation cannot be understated.
The technical nature of this vulnerability falls under the category of UI spoofing attacks where an attacker can craft malicious network traffic designed to manipulate how password prompts appear to users. When Chrome processes untrusted input without proper validation, it creates an opportunity for attackers to inject crafted data that alters the visual presentation of password fields or related interface elements. This type of vulnerability directly relates to CWE-20, which covers "Improper Input Validation" and can enable more sophisticated attacks when combined with other techniques. The attack vector specifically involves network-based malicious traffic that exploits the browser's failure to properly validate input before rendering user interface components.
The operational impact of this vulnerability extends beyond simple visual manipulation as it creates a potential pathway for social engineering attacks against users. When users encounter manipulated password prompts, they may unknowingly enter credentials into maliciously altered interfaces that appear legitimate. This represents a significant risk to user security since the attack relies on user trust in the browser interface and can potentially lead to credential theft or other malicious actions. The vulnerability exists in the context of how browsers handle authentication prompts and demonstrates the importance of maintaining strict input validation at all levels of application processing. Security researchers have noted that such UI manipulation vulnerabilities often serve as initial footholds for more complex attacks within the broader attack chain.
Mitigation strategies for this vulnerability involve both immediate remediation and broader architectural improvements to browser security mechanisms. The primary solution requires updating Chrome to version 151.0.7922.72 or later where proper input validation has been implemented. Organizations should also implement network monitoring to detect suspicious traffic patterns that might indicate attempts to exploit this vulnerability. From a defensive perspective, browsers should adopt more robust input sanitization techniques and implement additional checks for interface elements that handle sensitive user data. The ATT&CK framework categorizes such vulnerabilities under T1056.001 which covers "Input Injection: Data Encoding" and highlights the need for comprehensive validation of all user-facing inputs. Additionally, implementing Content Security Policy controls and browser sandboxing mechanisms can provide additional layers of protection against similar exploitation techniques.
The vulnerability demonstrates the critical importance of maintaining strict input validation in security-sensitive contexts like password handling and authentication interfaces. It reinforces industry best practices around defense in depth where multiple layers of security controls work together to prevent exploitation. Organizations should also consider implementing user education programs about recognizing potentially manipulated UI elements and establishing incident response procedures for detecting and responding to such attacks. The remediation process extends beyond simple patching to include comprehensive security testing of user interface components and validation of all input handling mechanisms in web browsers and applications.