CVE-2026-13893 in Chrome
Summary
by MITRE • 07/01/2026
Insufficient validation of untrusted input in WebUI in Google Chrome prior to 150.0.7871.47 allowed a remote attacker to leak cross-origin data via malicious network traffic. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 07/01/2026
This vulnerability represents a critical cross-origin data leakage issue within the Google Chrome web browser's user interface components. The flaw stems from inadequate validation mechanisms that fail to properly sanitize untrusted input received through network traffic, creating an avenue for remote attackers to exploit the system. The vulnerability affects Chrome versions prior to 150.0.7871.47 and operates at a medium severity level according to Chromium's security classification framework.
The technical implementation of this vulnerability occurs within the WebUI subsystem where user interface elements process incoming network data without sufficient validation checks. When malicious actors craft specially crafted network requests containing untrusted input, the browser's WebUI components fail to properly isolate or validate these inputs before processing them. This insufficient validation creates a pathway for cross-origin information disclosure where data from one origin can be accessed or extracted by another origin through carefully constructed malicious traffic patterns.
The operational impact of this vulnerability extends beyond simple data leakage and represents a significant threat to web application security and user privacy. Attackers can leverage this weakness to gather sensitive information from different origins, potentially including session tokens, authentication credentials, or other confidential data that should remain isolated between different web applications or domains. The cross-origin nature of the attack means that malicious actors can bypass standard browser security mechanisms designed to prevent such information disclosure between different trust domains.
This vulnerability aligns with CWE-20, which addresses "Improper Input Validation" in software security frameworks and corresponds to techniques described in the MITRE ATT&CK framework under T1071.004 for application layer protocol manipulation. The attack vector specifically targets the browser's user interface processing components, making it particularly dangerous as it operates at a level where users interact with web content. Organizations using affected Chrome versions face risks of data exfiltration and potential credential theft through this cross-origin information leakage mechanism.
Mitigation strategies should prioritize immediate patching to Chrome version 150.0.7871.47 or later, which includes the necessary input validation improvements. Network administrators should also implement additional monitoring for suspicious traffic patterns that might indicate exploitation attempts, while security teams should review their incident response procedures to address potential cross-origin data leakage scenarios. Browser vendors and security researchers continue to emphasize the importance of robust input validation in user interface components as demonstrated by this vulnerability's classification and remediation approach.